diff --git a/python/plugins/processing/gui/AlgorithmDialog.py b/python/plugins/processing/gui/AlgorithmDialog.py
index e1b5cd6060a..3bf0e228ff3 100644
--- a/python/plugins/processing/gui/AlgorithmDialog.py
+++ b/python/plugins/processing/gui/AlgorithmDialog.py
@@ -28,7 +28,7 @@ __revision__ = '$Format:%H$'
 from pprint import pformat
 import time
 
-from qgis.PyQt.QtCore import QCoreApplication
+from qgis.PyQt.QtCore import QCoreApplication, Qt
 from qgis.PyQt.QtWidgets import QMessageBox, QPushButton, QSizePolicy, QDialogButtonBox
 from qgis.PyQt.QtGui import QColor, QPalette
 
@@ -241,6 +241,7 @@ class AlgorithmDialog(QgsProcessingAlgorithmDialogBase):
                     feedback.pushInfo('')
 
                     self.cancelButton().setEnabled(False)
+
                     self.finish(ok, results, context, feedback)
 
                 if self.algorithm().flags() & QgsProcessingAlgorithm.FlagCanRunInBackground:
@@ -248,7 +249,6 @@ class AlgorithmDialog(QgsProcessingAlgorithmDialogBase):
                     task.executed.connect(on_complete)
                     QgsApplication.taskManager().addTask(task)
                 else:
-                    self.setWindowModality(Qt.ApplicationModal)
                     ok, results = execute(self.algorithm(), parameters, context, feedback)
                     on_complete(ok, results)
 
diff --git a/src/3d/processing/qgsalgorithmtessellate.cpp b/src/3d/processing/qgsalgorithmtessellate.cpp
index 0611ce2a913..445419bdfdb 100644
--- a/src/3d/processing/qgsalgorithmtessellate.cpp
+++ b/src/3d/processing/qgsalgorithmtessellate.cpp
@@ -31,6 +31,11 @@ QString QgsTessellateAlgorithm::displayName() const
   return QObject::tr( "Tessellate" );
 }
 
+QgsProcessingAlgorithm::Flags QgsTessellateAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QStringList QgsTessellateAlgorithm::tags() const
 {
   return QObject::tr( "3d,triangle" ).split( ',' );
diff --git a/src/3d/processing/qgsalgorithmtessellate.h b/src/3d/processing/qgsalgorithmtessellate.h
index bbde9138c56..660f452347e 100644
--- a/src/3d/processing/qgsalgorithmtessellate.h
+++ b/src/3d/processing/qgsalgorithmtessellate.h
@@ -36,6 +36,7 @@ class QgsTessellateAlgorithm : public QgsProcessingFeatureBasedAlgorithm
     QgsTessellateAlgorithm() = default;
     QString name() const override;
     QString displayName() const override;
+    Flags flags() const override;
     QStringList tags() const override;
     QString group() const override;
     QString shortHelpString() const override;
diff --git a/src/analysis/processing/qgsalgorithmaddincrementalfield.cpp b/src/analysis/processing/qgsalgorithmaddincrementalfield.cpp
index ed5be287b62..d21d110bdc5 100644
--- a/src/analysis/processing/qgsalgorithmaddincrementalfield.cpp
+++ b/src/analysis/processing/qgsalgorithmaddincrementalfield.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsAddIncrementalFieldAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsAddIncrementalFieldAlgorithm::name() const
 {
   return QStringLiteral( "addautoincrementalfield" );
diff --git a/src/analysis/processing/qgsalgorithmaddincrementalfield.h b/src/analysis/processing/qgsalgorithmaddincrementalfield.h
index aed49e22b6d..d9478b5a0b2 100644
--- a/src/analysis/processing/qgsalgorithmaddincrementalfield.h
+++ b/src/analysis/processing/qgsalgorithmaddincrementalfield.h
@@ -34,6 +34,7 @@ class QgsAddIncrementalFieldAlgorithm : public QgsProcessingFeatureBasedAlgorith
   public:
 
     QgsAddIncrementalFieldAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmassignprojection.cpp b/src/analysis/processing/qgsalgorithmassignprojection.cpp
index a5e95e5a161..fd4bcac6fa8 100644
--- a/src/analysis/processing/qgsalgorithmassignprojection.cpp
+++ b/src/analysis/processing/qgsalgorithmassignprojection.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsAssignProjectionAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsAssignProjectionAlgorithm::name() const
 {
   return QStringLiteral( "assignprojection" );
diff --git a/src/analysis/processing/qgsalgorithmassignprojection.h b/src/analysis/processing/qgsalgorithmassignprojection.h
index c1eb030cad7..e066ae27b6f 100644
--- a/src/analysis/processing/qgsalgorithmassignprojection.h
+++ b/src/analysis/processing/qgsalgorithmassignprojection.h
@@ -34,6 +34,7 @@ class QgsAssignProjectionAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsAssignProjectionAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmboundary.cpp b/src/analysis/processing/qgsalgorithmboundary.cpp
index a313cc87074..64c3854d097 100644
--- a/src/analysis/processing/qgsalgorithmboundary.cpp
+++ b/src/analysis/processing/qgsalgorithmboundary.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsBoundaryAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsBoundaryAlgorithm::name() const
 {
   return QStringLiteral( "boundary" );
diff --git a/src/analysis/processing/qgsalgorithmboundary.h b/src/analysis/processing/qgsalgorithmboundary.h
index 232e944112b..36a47ce99ed 100644
--- a/src/analysis/processing/qgsalgorithmboundary.h
+++ b/src/analysis/processing/qgsalgorithmboundary.h
@@ -34,6 +34,7 @@ class QgsBoundaryAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsBoundaryAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmboundingbox.cpp b/src/analysis/processing/qgsalgorithmboundingbox.cpp
index 1034fddb362..c0669e7cc32 100644
--- a/src/analysis/processing/qgsalgorithmboundingbox.cpp
+++ b/src/analysis/processing/qgsalgorithmboundingbox.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsBoundingBoxAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsBoundingBoxAlgorithm::name() const
 {
   return QStringLiteral( "boundingboxes" );
diff --git a/src/analysis/processing/qgsalgorithmboundingbox.h b/src/analysis/processing/qgsalgorithmboundingbox.h
index 848e2dbb983..a72c34769d1 100644
--- a/src/analysis/processing/qgsalgorithmboundingbox.h
+++ b/src/analysis/processing/qgsalgorithmboundingbox.h
@@ -34,6 +34,7 @@ class QgsBoundingBoxAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsBoundingBoxAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmbuffer.cpp b/src/analysis/processing/qgsalgorithmbuffer.cpp
index 61be4ad8fbb..6819c26399b 100644
--- a/src/analysis/processing/qgsalgorithmbuffer.cpp
+++ b/src/analysis/processing/qgsalgorithmbuffer.cpp
@@ -63,6 +63,11 @@ void QgsBufferAlgorithm::initAlgorithm( const QVariantMap & )
   addParameter( new QgsProcessingParameterFeatureSink( QStringLiteral( "OUTPUT" ), QObject::tr( "Buffered" ), QgsProcessing::TypeVectorPolygon ) );
 }
 
+QgsProcessingAlgorithm::Flags QgsBufferAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsBufferAlgorithm::shortHelpString() const
 {
   return QObject::tr( "This algorithm computes a buffer area for all the features in an input layer, using a fixed or dynamic distance.\n\n"
diff --git a/src/analysis/processing/qgsalgorithmbuffer.h b/src/analysis/processing/qgsalgorithmbuffer.h
index 66ca273136a..da572377c7d 100644
--- a/src/analysis/processing/qgsalgorithmbuffer.h
+++ b/src/analysis/processing/qgsalgorithmbuffer.h
@@ -35,7 +35,7 @@ class QgsBufferAlgorithm : public QgsProcessingAlgorithm
 
     QgsBufferAlgorithm() = default;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
-
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmcentroid.cpp b/src/analysis/processing/qgsalgorithmcentroid.cpp
index 67accb861d2..3ec7b22110d 100644
--- a/src/analysis/processing/qgsalgorithmcentroid.cpp
+++ b/src/analysis/processing/qgsalgorithmcentroid.cpp
@@ -49,6 +49,11 @@ QString QgsCentroidAlgorithm::outputName() const
   return QObject::tr( "Centroids" );
 }
 
+QgsProcessingAlgorithm::Flags QgsCentroidAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsCentroidAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
diff --git a/src/analysis/processing/qgsalgorithmcentroid.h b/src/analysis/processing/qgsalgorithmcentroid.h
index bc9d20867c6..9cbc4972f36 100644
--- a/src/analysis/processing/qgsalgorithmcentroid.h
+++ b/src/analysis/processing/qgsalgorithmcentroid.h
@@ -34,6 +34,7 @@ class QgsCentroidAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsCentroidAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmclip.cpp b/src/analysis/processing/qgsalgorithmclip.cpp
index 8f6dd740298..0b4d71f5564 100644
--- a/src/analysis/processing/qgsalgorithmclip.cpp
+++ b/src/analysis/processing/qgsalgorithmclip.cpp
@@ -40,6 +40,11 @@ QString QgsClipAlgorithm::group() const
   return QObject::tr( "Vector overlay" );
 }
 
+QgsProcessingAlgorithm::Flags QgsClipAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsClipAlgorithm::groupId() const
 {
   return QStringLiteral( "vectoroverlay" );
diff --git a/src/analysis/processing/qgsalgorithmclip.h b/src/analysis/processing/qgsalgorithmclip.h
index 38a10c0f91b..ffc9dc7a034 100644
--- a/src/analysis/processing/qgsalgorithmclip.h
+++ b/src/analysis/processing/qgsalgorithmclip.h
@@ -34,6 +34,7 @@ class QgsClipAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsClipAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmconvexhull.cpp b/src/analysis/processing/qgsalgorithmconvexhull.cpp
index 5ff1455b70d..1d89f09ca07 100644
--- a/src/analysis/processing/qgsalgorithmconvexhull.cpp
+++ b/src/analysis/processing/qgsalgorithmconvexhull.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsConvexHullAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsConvexHullAlgorithm::name() const
 {
   return QStringLiteral( "convexhull" );
diff --git a/src/analysis/processing/qgsalgorithmconvexhull.h b/src/analysis/processing/qgsalgorithmconvexhull.h
index 9c47aff30b9..a0e8fb9f809 100644
--- a/src/analysis/processing/qgsalgorithmconvexhull.h
+++ b/src/analysis/processing/qgsalgorithmconvexhull.h
@@ -35,6 +35,7 @@ class QgsConvexHullAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsConvexHullAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmdissolve.cpp b/src/analysis/processing/qgsalgorithmdissolve.cpp
index 960b09a8678..e4cfb34eb60 100644
--- a/src/analysis/processing/qgsalgorithmdissolve.cpp
+++ b/src/analysis/processing/qgsalgorithmdissolve.cpp
@@ -23,6 +23,11 @@
 // QgsCollectorAlgorithm
 //
 
+QgsProcessingAlgorithm::Flags QgsCollectorAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QVariantMap QgsCollectorAlgorithm::processCollection( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback,
     const std::function<QgsGeometry( const QVector< QgsGeometry >& )> &collector, int maxQueueLength )
 {
diff --git a/src/analysis/processing/qgsalgorithmdissolve.h b/src/analysis/processing/qgsalgorithmdissolve.h
index 2c98fc5f066..2607bf62203 100644
--- a/src/analysis/processing/qgsalgorithmdissolve.h
+++ b/src/analysis/processing/qgsalgorithmdissolve.h
@@ -32,6 +32,7 @@ class QgsCollectorAlgorithm : public QgsProcessingAlgorithm
 {
   protected:
 
+    Flags flags() const override;
     QVariantMap processCollection( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback,
                                    const std::function<QgsGeometry( const QVector<QgsGeometry>& )> &collector, int maxQueueLength = 0 );
 };
diff --git a/src/analysis/processing/qgsalgorithmdropgeometry.cpp b/src/analysis/processing/qgsalgorithmdropgeometry.cpp
index 56bf878aca1..a7a7c0c0e60 100644
--- a/src/analysis/processing/qgsalgorithmdropgeometry.cpp
+++ b/src/analysis/processing/qgsalgorithmdropgeometry.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsDropGeometryAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsDropGeometryAlgorithm::name() const
 {
   return QStringLiteral( "dropgeometries" );
diff --git a/src/analysis/processing/qgsalgorithmdropgeometry.h b/src/analysis/processing/qgsalgorithmdropgeometry.h
index b3b8c8d5a23..912a1caf624 100644
--- a/src/analysis/processing/qgsalgorithmdropgeometry.h
+++ b/src/analysis/processing/qgsalgorithmdropgeometry.h
@@ -34,6 +34,7 @@ class QgsDropGeometryAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsDropGeometryAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmdropmzvalues.cpp b/src/analysis/processing/qgsalgorithmdropmzvalues.cpp
index dc6bce0294e..f02865878a8 100644
--- a/src/analysis/processing/qgsalgorithmdropmzvalues.cpp
+++ b/src/analysis/processing/qgsalgorithmdropmzvalues.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsDropMZValuesAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsDropMZValuesAlgorithm::name() const
 {
   return QStringLiteral( "dropmzvalues" );
diff --git a/src/analysis/processing/qgsalgorithmdropmzvalues.h b/src/analysis/processing/qgsalgorithmdropmzvalues.h
index 52cbe05b1d2..869c6624360 100644
--- a/src/analysis/processing/qgsalgorithmdropmzvalues.h
+++ b/src/analysis/processing/qgsalgorithmdropmzvalues.h
@@ -34,6 +34,7 @@ class QgsDropMZValuesAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsDropMZValuesAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmextenttolayer.cpp b/src/analysis/processing/qgsalgorithmextenttolayer.cpp
index c7b8938d787..63f290606d2 100644
--- a/src/analysis/processing/qgsalgorithmextenttolayer.cpp
+++ b/src/analysis/processing/qgsalgorithmextenttolayer.cpp
@@ -24,6 +24,11 @@ QString QgsExtentToLayerAlgorithm::name() const
   return QStringLiteral( "extenttolayer" );
 }
 
+QgsProcessingAlgorithm::Flags QgsExtentToLayerAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsExtentToLayerAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterExtent( QStringLiteral( "INPUT" ), QObject::tr( "Extent" ) ) );
diff --git a/src/analysis/processing/qgsalgorithmextenttolayer.h b/src/analysis/processing/qgsalgorithmextenttolayer.h
index bfd7c6600b3..541d6104421 100644
--- a/src/analysis/processing/qgsalgorithmextenttolayer.h
+++ b/src/analysis/processing/qgsalgorithmextenttolayer.h
@@ -34,6 +34,7 @@ class QgsExtentToLayerAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsExtentToLayerAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override { return QObject::tr( "Create layer from extent" ); }
diff --git a/src/analysis/processing/qgsalgorithmextractbyattribute.cpp b/src/analysis/processing/qgsalgorithmextractbyattribute.cpp
index 7b220824ab7..be08b44d2d3 100644
--- a/src/analysis/processing/qgsalgorithmextractbyattribute.cpp
+++ b/src/analysis/processing/qgsalgorithmextractbyattribute.cpp
@@ -39,6 +39,11 @@ QString QgsExtractByAttributeAlgorithm::group() const
   return QObject::tr( "Vector selection" );
 }
 
+QgsProcessingAlgorithm::Flags QgsExtractByAttributeAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsExtractByAttributeAlgorithm::groupId() const
 {
   return QStringLiteral( "vectorselection" );
diff --git a/src/analysis/processing/qgsalgorithmextractbyattribute.h b/src/analysis/processing/qgsalgorithmextractbyattribute.h
index 11455795533..aa0cdc815e0 100644
--- a/src/analysis/processing/qgsalgorithmextractbyattribute.h
+++ b/src/analysis/processing/qgsalgorithmextractbyattribute.h
@@ -49,6 +49,7 @@ class QgsExtractByAttributeAlgorithm : public QgsProcessingAlgorithm
     };
 
     QgsExtractByAttributeAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmextractbyexpression.cpp b/src/analysis/processing/qgsalgorithmextractbyexpression.cpp
index dd9a03579f7..04b2bf4889c 100644
--- a/src/analysis/processing/qgsalgorithmextractbyexpression.cpp
+++ b/src/analysis/processing/qgsalgorithmextractbyexpression.cpp
@@ -44,6 +44,11 @@ QString QgsExtractByExpressionAlgorithm::groupId() const
   return QStringLiteral( "vectorselection" );
 }
 
+QgsProcessingAlgorithm::Flags QgsExtractByExpressionAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsExtractByExpressionAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
diff --git a/src/analysis/processing/qgsalgorithmextractbyexpression.h b/src/analysis/processing/qgsalgorithmextractbyexpression.h
index 9ee177a45c1..790eec9b77c 100644
--- a/src/analysis/processing/qgsalgorithmextractbyexpression.h
+++ b/src/analysis/processing/qgsalgorithmextractbyexpression.h
@@ -34,6 +34,7 @@ class QgsExtractByExpressionAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsExtractByExpressionAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmextractbyextent.cpp b/src/analysis/processing/qgsalgorithmextractbyextent.cpp
index 75877cbbb61..b3d1ca14ee3 100644
--- a/src/analysis/processing/qgsalgorithmextractbyextent.cpp
+++ b/src/analysis/processing/qgsalgorithmextractbyextent.cpp
@@ -44,6 +44,11 @@ QString QgsExtractByExtentAlgorithm::groupId() const
   return QStringLiteral( "vectoroverlay" );
 }
 
+QgsProcessingAlgorithm::Flags QgsExtractByExtentAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsExtractByExtentAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
diff --git a/src/analysis/processing/qgsalgorithmextractbyextent.h b/src/analysis/processing/qgsalgorithmextractbyextent.h
index 87df6a29712..b714a5ed3f3 100644
--- a/src/analysis/processing/qgsalgorithmextractbyextent.h
+++ b/src/analysis/processing/qgsalgorithmextractbyextent.h
@@ -34,6 +34,7 @@ class QgsExtractByExtentAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsExtractByExtentAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmextractbylocation.cpp b/src/analysis/processing/qgsalgorithmextractbylocation.cpp
index 8d6927d7cce..d08f0cb22cd 100644
--- a/src/analysis/processing/qgsalgorithmextractbylocation.cpp
+++ b/src/analysis/processing/qgsalgorithmextractbylocation.cpp
@@ -286,6 +286,11 @@ QVariantMap QgsSelectByLocationAlgorithm::processAlgorithm( const QVariantMap &p
 // QgsExtractByLocationAlgorithm
 //
 
+QgsProcessingAlgorithm::Flags QgsExtractByLocationAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsExtractByLocationAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterVectorLayer( QStringLiteral( "INPUT" ), QObject::tr( "Extract features from" ),
diff --git a/src/analysis/processing/qgsalgorithmextractbylocation.h b/src/analysis/processing/qgsalgorithmextractbylocation.h
index 5a69277e1db..ce1f9cbcbf5 100644
--- a/src/analysis/processing/qgsalgorithmextractbylocation.h
+++ b/src/analysis/processing/qgsalgorithmextractbylocation.h
@@ -87,6 +87,7 @@ class QgsExtractByLocationAlgorithm : public QgsLocationBasedAlgorithm
   public:
 
     QgsExtractByLocationAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmextractnodes.cpp b/src/analysis/processing/qgsalgorithmextractnodes.cpp
index 8b41906084f..22be063b258 100644
--- a/src/analysis/processing/qgsalgorithmextractnodes.cpp
+++ b/src/analysis/processing/qgsalgorithmextractnodes.cpp
@@ -59,6 +59,11 @@ QgsExtractNodesAlgorithm *QgsExtractNodesAlgorithm::createInstance() const
   return new QgsExtractNodesAlgorithm();
 }
 
+QgsProcessingAlgorithm::Flags QgsExtractNodesAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsExtractNodesAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
diff --git a/src/analysis/processing/qgsalgorithmextractnodes.h b/src/analysis/processing/qgsalgorithmextractnodes.h
index e1589b2da5b..18e60750048 100644
--- a/src/analysis/processing/qgsalgorithmextractnodes.h
+++ b/src/analysis/processing/qgsalgorithmextractnodes.h
@@ -34,6 +34,7 @@ class QgsExtractNodesAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsExtractNodesAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmfiledownloader.cpp b/src/analysis/processing/qgsalgorithmfiledownloader.cpp
index 1ee12618528..2c768ceeb65 100644
--- a/src/analysis/processing/qgsalgorithmfiledownloader.cpp
+++ b/src/analysis/processing/qgsalgorithmfiledownloader.cpp
@@ -60,6 +60,11 @@ QgsFileDownloaderAlgorithm *QgsFileDownloaderAlgorithm::createInstance() const
   return new QgsFileDownloaderAlgorithm();
 }
 
+QgsProcessingAlgorithm::Flags QgsFileDownloaderAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsFileDownloaderAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterString( QStringLiteral( "URL" ), tr( "URL" ), QVariant(), false, false ) );
diff --git a/src/analysis/processing/qgsalgorithmfiledownloader.h b/src/analysis/processing/qgsalgorithmfiledownloader.h
index a6d13f705be..8ad2e56e164 100644
--- a/src/analysis/processing/qgsalgorithmfiledownloader.h
+++ b/src/analysis/processing/qgsalgorithmfiledownloader.h
@@ -34,6 +34,7 @@ class QgsFileDownloaderAlgorithm : public QgsProcessingAlgorithm, public QObject
 {
   public:
     QgsFileDownloaderAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmfixgeometries.cpp b/src/analysis/processing/qgsalgorithmfixgeometries.cpp
index db778a259ec..9fa833ba328 100644
--- a/src/analysis/processing/qgsalgorithmfixgeometries.cpp
+++ b/src/analysis/processing/qgsalgorithmfixgeometries.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsFixGeometriesAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsFixGeometriesAlgorithm::name() const
 {
   return QStringLiteral( "fixgeometries" );
diff --git a/src/analysis/processing/qgsalgorithmfixgeometries.h b/src/analysis/processing/qgsalgorithmfixgeometries.h
index aa46626b938..cc2fa01649c 100644
--- a/src/analysis/processing/qgsalgorithmfixgeometries.h
+++ b/src/analysis/processing/qgsalgorithmfixgeometries.h
@@ -34,6 +34,7 @@ class QgsFixGeometriesAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsFixGeometriesAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmjoinbyattribute.cpp b/src/analysis/processing/qgsalgorithmjoinbyattribute.cpp
index 2c3ad80873b..de7fbc50ccb 100644
--- a/src/analysis/processing/qgsalgorithmjoinbyattribute.cpp
+++ b/src/analysis/processing/qgsalgorithmjoinbyattribute.cpp
@@ -44,6 +44,11 @@ QString QgsJoinByAttributeAlgorithm::groupId() const
   return QStringLiteral( "vectorgeneral" );
 }
 
+QgsProcessingAlgorithm::Flags QgsJoinByAttributeAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsJoinByAttributeAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ),
diff --git a/src/analysis/processing/qgsalgorithmjoinbyattribute.h b/src/analysis/processing/qgsalgorithmjoinbyattribute.h
index b29b993a6b4..59e717b0404 100644
--- a/src/analysis/processing/qgsalgorithmjoinbyattribute.h
+++ b/src/analysis/processing/qgsalgorithmjoinbyattribute.h
@@ -34,6 +34,7 @@ class QgsJoinByAttributeAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsJoinByAttributeAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmjoinwithlines.cpp b/src/analysis/processing/qgsalgorithmjoinwithlines.cpp
index e4a459e909c..98743255a54 100644
--- a/src/analysis/processing/qgsalgorithmjoinwithlines.cpp
+++ b/src/analysis/processing/qgsalgorithmjoinwithlines.cpp
@@ -45,6 +45,11 @@ QString QgsJoinWithLinesAlgorithm::groupId() const
   return QStringLiteral( "vectoranalysis" );
 }
 
+QgsProcessingAlgorithm::Flags QgsJoinWithLinesAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsJoinWithLinesAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "HUBS" ),
diff --git a/src/analysis/processing/qgsalgorithmjoinwithlines.h b/src/analysis/processing/qgsalgorithmjoinwithlines.h
index 6212476beb3..c0bfb47415a 100644
--- a/src/analysis/processing/qgsalgorithmjoinwithlines.h
+++ b/src/analysis/processing/qgsalgorithmjoinwithlines.h
@@ -34,6 +34,7 @@ class QgsJoinWithLinesAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsJoinWithLinesAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmlineintersection.cpp b/src/analysis/processing/qgsalgorithmlineintersection.cpp
index 7ff1ed6878c..1c83ff37a37 100644
--- a/src/analysis/processing/qgsalgorithmlineintersection.cpp
+++ b/src/analysis/processing/qgsalgorithmlineintersection.cpp
@@ -45,6 +45,11 @@ QString QgsLineIntersectionAlgorithm::groupId() const
   return QStringLiteral( "vectoroverlay" );
 }
 
+QgsProcessingAlgorithm::Flags QgsLineIntersectionAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsLineIntersectionAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ),
diff --git a/src/analysis/processing/qgsalgorithmlineintersection.h b/src/analysis/processing/qgsalgorithmlineintersection.h
index ae9f8f44ae8..28f98008eca 100644
--- a/src/analysis/processing/qgsalgorithmlineintersection.h
+++ b/src/analysis/processing/qgsalgorithmlineintersection.h
@@ -34,6 +34,7 @@ class QgsLineIntersectionAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsLineIntersectionAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmloadlayer.cpp b/src/analysis/processing/qgsalgorithmloadlayer.cpp
index 271640f7f10..46719509b9f 100644
--- a/src/analysis/processing/qgsalgorithmloadlayer.cpp
+++ b/src/analysis/processing/qgsalgorithmloadlayer.cpp
@@ -26,7 +26,7 @@ QString QgsLoadLayerAlgorithm::name() const
 
 QgsProcessingAlgorithm::Flags QgsLoadLayerAlgorithm::flags() const
 {
-  return FlagHideFromToolbox;
+  return FlagHideFromToolbox | QgsProcessingAlgorithm::FlagCanRunInBackground;
 }
 
 QString QgsLoadLayerAlgorithm::displayName() const
diff --git a/src/analysis/processing/qgsalgorithmmeancoordinates.cpp b/src/analysis/processing/qgsalgorithmmeancoordinates.cpp
index a0c68dd54fc..c447ad37b08 100644
--- a/src/analysis/processing/qgsalgorithmmeancoordinates.cpp
+++ b/src/analysis/processing/qgsalgorithmmeancoordinates.cpp
@@ -44,6 +44,11 @@ QString QgsMeanCoordinatesAlgorithm::groupId() const
   return QStringLiteral( "vectoranalysis" );
 }
 
+QgsProcessingAlgorithm::Flags QgsMeanCoordinatesAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsMeanCoordinatesAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ),
diff --git a/src/analysis/processing/qgsalgorithmmeancoordinates.h b/src/analysis/processing/qgsalgorithmmeancoordinates.h
index cdcbde630e0..a24207152a0 100644
--- a/src/analysis/processing/qgsalgorithmmeancoordinates.h
+++ b/src/analysis/processing/qgsalgorithmmeancoordinates.h
@@ -35,6 +35,7 @@ class QgsMeanCoordinatesAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsMeanCoordinatesAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmmergelines.cpp b/src/analysis/processing/qgsalgorithmmergelines.cpp
index 352ee76ace9..4bae2a471ea 100644
--- a/src/analysis/processing/qgsalgorithmmergelines.cpp
+++ b/src/analysis/processing/qgsalgorithmmergelines.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsMergeLinesAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsMergeLinesAlgorithm::name() const
 {
   return QStringLiteral( "mergelines" );
diff --git a/src/analysis/processing/qgsalgorithmmergelines.h b/src/analysis/processing/qgsalgorithmmergelines.h
index 70245fd2121..6c33940ec38 100644
--- a/src/analysis/processing/qgsalgorithmmergelines.h
+++ b/src/analysis/processing/qgsalgorithmmergelines.h
@@ -38,6 +38,7 @@ class QgsMergeLinesAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsMergeLinesAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmmergevector.cpp b/src/analysis/processing/qgsalgorithmmergevector.cpp
index 19004239d7b..e9cd3dd91ba 100644
--- a/src/analysis/processing/qgsalgorithmmergevector.cpp
+++ b/src/analysis/processing/qgsalgorithmmergevector.cpp
@@ -39,6 +39,11 @@ QString QgsMergeVectorAlgorithm::group() const
   return QObject::tr( "Vector general" );
 }
 
+QgsProcessingAlgorithm::Flags QgsMergeVectorAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsMergeVectorAlgorithm::groupId() const
 {
   return QStringLiteral( "vectorgeneral" );
diff --git a/src/analysis/processing/qgsalgorithmmergevector.h b/src/analysis/processing/qgsalgorithmmergevector.h
index 00371453a37..66986ffa6e5 100644
--- a/src/analysis/processing/qgsalgorithmmergevector.h
+++ b/src/analysis/processing/qgsalgorithmmergevector.h
@@ -34,6 +34,7 @@ class QgsMergeVectorAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsMergeVectorAlgorithm() = default;
+    QgsProcessingAlgorithm::Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmminimumenclosingcircle.cpp b/src/analysis/processing/qgsalgorithmminimumenclosingcircle.cpp
index e855bcd3784..ca659d494d3 100644
--- a/src/analysis/processing/qgsalgorithmminimumenclosingcircle.cpp
+++ b/src/analysis/processing/qgsalgorithmminimumenclosingcircle.cpp
@@ -54,6 +54,11 @@ QgsWkbTypes::Type QgsMinimumEnclosingCircleAlgorithm::outputWkbType( QgsWkbTypes
   return QgsWkbTypes::Polygon;
 }
 
+QgsProcessingAlgorithm::Flags QgsMinimumEnclosingCircleAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsMinimumEnclosingCircleAlgorithm::initParameters( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterNumber( QStringLiteral( "SEGMENTS" ), QObject::tr( "Number of segments in circles" ), QgsProcessingParameterNumber::Integer,
diff --git a/src/analysis/processing/qgsalgorithmminimumenclosingcircle.h b/src/analysis/processing/qgsalgorithmminimumenclosingcircle.h
index 71e13407427..fec6acf29c8 100644
--- a/src/analysis/processing/qgsalgorithmminimumenclosingcircle.h
+++ b/src/analysis/processing/qgsalgorithmminimumenclosingcircle.h
@@ -34,6 +34,7 @@ class QgsMinimumEnclosingCircleAlgorithm : public QgsProcessingFeatureBasedAlgor
   public:
 
     QgsMinimumEnclosingCircleAlgorithm() = default;
+    Flags flags() const override;
     void initParameters( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmmultiparttosinglepart.cpp b/src/analysis/processing/qgsalgorithmmultiparttosinglepart.cpp
index 36f7818c945..69821e29bd8 100644
--- a/src/analysis/processing/qgsalgorithmmultiparttosinglepart.cpp
+++ b/src/analysis/processing/qgsalgorithmmultiparttosinglepart.cpp
@@ -44,6 +44,11 @@ QString QgsMultipartToSinglepartAlgorithm::groupId() const
   return QStringLiteral( "vectorgeometry" );
 }
 
+QgsProcessingAlgorithm::Flags QgsMultipartToSinglepartAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsMultipartToSinglepartAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
diff --git a/src/analysis/processing/qgsalgorithmmultiparttosinglepart.h b/src/analysis/processing/qgsalgorithmmultiparttosinglepart.h
index 5adc4e11906..1f93a385c8d 100644
--- a/src/analysis/processing/qgsalgorithmmultiparttosinglepart.h
+++ b/src/analysis/processing/qgsalgorithmmultiparttosinglepart.h
@@ -34,6 +34,7 @@ class QgsMultipartToSinglepartAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsMultipartToSinglepartAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmorderbyexpression.cpp b/src/analysis/processing/qgsalgorithmorderbyexpression.cpp
index 6a9b7e4f1ba..faa6b5f10ed 100644
--- a/src/analysis/processing/qgsalgorithmorderbyexpression.cpp
+++ b/src/analysis/processing/qgsalgorithmorderbyexpression.cpp
@@ -47,6 +47,11 @@ QString QgsOrderByExpressionAlgorithm::groupId() const
   return QStringLiteral( "vectorgeneral" );
 }
 
+QgsProcessingAlgorithm::Flags QgsOrderByExpressionAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsOrderByExpressionAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
diff --git a/src/analysis/processing/qgsalgorithmorderbyexpression.h b/src/analysis/processing/qgsalgorithmorderbyexpression.h
index 3afc8c66db1..cd2599fc843 100644
--- a/src/analysis/processing/qgsalgorithmorderbyexpression.h
+++ b/src/analysis/processing/qgsalgorithmorderbyexpression.h
@@ -34,6 +34,7 @@ class QgsOrderByExpressionAlgorithm : public QgsProcessingAlgorithm
 {
   public:
     QgsOrderByExpressionAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmorientedminimumboundingbox.cpp b/src/analysis/processing/qgsalgorithmorientedminimumboundingbox.cpp
index 44424341a22..a5154664d53 100644
--- a/src/analysis/processing/qgsalgorithmorientedminimumboundingbox.cpp
+++ b/src/analysis/processing/qgsalgorithmorientedminimumboundingbox.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsOrientedMinimumBoundingBoxAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsOrientedMinimumBoundingBoxAlgorithm::name() const
 {
   return QStringLiteral( "orientedminimumboundingbox" );
diff --git a/src/analysis/processing/qgsalgorithmorientedminimumboundingbox.h b/src/analysis/processing/qgsalgorithmorientedminimumboundingbox.h
index d7056394914..ac7de53d080 100644
--- a/src/analysis/processing/qgsalgorithmorientedminimumboundingbox.h
+++ b/src/analysis/processing/qgsalgorithmorientedminimumboundingbox.h
@@ -34,6 +34,7 @@ class QgsOrientedMinimumBoundingBoxAlgorithm : public QgsProcessingFeatureBasedA
   public:
 
     QgsOrientedMinimumBoundingBoxAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmpackage.cpp b/src/analysis/processing/qgsalgorithmpackage.cpp
index 891f4d46c8f..4661126402b 100644
--- a/src/analysis/processing/qgsalgorithmpackage.cpp
+++ b/src/analysis/processing/qgsalgorithmpackage.cpp
@@ -47,6 +47,11 @@ QString QgsPackageAlgorithm::groupId() const
   return QStringLiteral( "database" );
 }
 
+QgsProcessingAlgorithm::Flags QgsPackageAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsPackageAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterMultipleLayers( QStringLiteral( "LAYERS" ), QObject::tr( "Input layers" ), QgsProcessing::TypeVector ) );
diff --git a/src/analysis/processing/qgsalgorithmpackage.h b/src/analysis/processing/qgsalgorithmpackage.h
index dc818d40577..9ac5e907a9e 100644
--- a/src/analysis/processing/qgsalgorithmpackage.h
+++ b/src/analysis/processing/qgsalgorithmpackage.h
@@ -36,6 +36,7 @@ class QgsPackageAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsPackageAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmpromotetomultipart.cpp b/src/analysis/processing/qgsalgorithmpromotetomultipart.cpp
index b761be0123d..05185ad42bf 100644
--- a/src/analysis/processing/qgsalgorithmpromotetomultipart.cpp
+++ b/src/analysis/processing/qgsalgorithmpromotetomultipart.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsPromoteToMultipartAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsPromoteToMultipartAlgorithm::name() const
 {
   return QStringLiteral( "promotetomulti" );
diff --git a/src/analysis/processing/qgsalgorithmpromotetomultipart.h b/src/analysis/processing/qgsalgorithmpromotetomultipart.h
index 2badf961a82..2004c4c39e7 100644
--- a/src/analysis/processing/qgsalgorithmpromotetomultipart.h
+++ b/src/analysis/processing/qgsalgorithmpromotetomultipart.h
@@ -35,6 +35,7 @@ class QgsPromoteToMultipartAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsPromoteToMultipartAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmrasterlayeruniquevalues.cpp b/src/analysis/processing/qgsalgorithmrasterlayeruniquevalues.cpp
index cf5449f9860..b1c21946795 100644
--- a/src/analysis/processing/qgsalgorithmrasterlayeruniquevalues.cpp
+++ b/src/analysis/processing/qgsalgorithmrasterlayeruniquevalues.cpp
@@ -44,6 +44,11 @@ QString QgsRasterLayerUniqueValuesReportAlgorithm::groupId() const
   return QStringLiteral( "rasteranalysis" );
 }
 
+QgsProcessingAlgorithm::Flags QgsRasterLayerUniqueValuesReportAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsRasterLayerUniqueValuesReportAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterRasterLayer( QStringLiteral( "INPUT" ),
diff --git a/src/analysis/processing/qgsalgorithmrasterlayeruniquevalues.h b/src/analysis/processing/qgsalgorithmrasterlayeruniquevalues.h
index 172f722fb3c..d230b9582d1 100644
--- a/src/analysis/processing/qgsalgorithmrasterlayeruniquevalues.h
+++ b/src/analysis/processing/qgsalgorithmrasterlayeruniquevalues.h
@@ -34,6 +34,7 @@ class QgsRasterLayerUniqueValuesReportAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsRasterLayerUniqueValuesReportAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmremoveduplicatenodes.cpp b/src/analysis/processing/qgsalgorithmremoveduplicatenodes.cpp
index 313b83b9589..597b5aad593 100644
--- a/src/analysis/processing/qgsalgorithmremoveduplicatenodes.cpp
+++ b/src/analysis/processing/qgsalgorithmremoveduplicatenodes.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsAlgorithmRemoveDuplicateNodes::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsAlgorithmRemoveDuplicateNodes::name() const
 {
   return QStringLiteral( "removeduplicatenodes" );
diff --git a/src/analysis/processing/qgsalgorithmremoveduplicatenodes.h b/src/analysis/processing/qgsalgorithmremoveduplicatenodes.h
index 92267bd2f1b..c4a009159ea 100644
--- a/src/analysis/processing/qgsalgorithmremoveduplicatenodes.h
+++ b/src/analysis/processing/qgsalgorithmremoveduplicatenodes.h
@@ -34,6 +34,7 @@ class QgsAlgorithmRemoveDuplicateNodes : public QgsProcessingFeatureBasedAlgorit
   public:
 
     QgsAlgorithmRemoveDuplicateNodes() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmremovenullgeometry.cpp b/src/analysis/processing/qgsalgorithmremovenullgeometry.cpp
index 6ff91765ffc..532d21d8cd1 100644
--- a/src/analysis/processing/qgsalgorithmremovenullgeometry.cpp
+++ b/src/analysis/processing/qgsalgorithmremovenullgeometry.cpp
@@ -44,6 +44,11 @@ QString QgsRemoveNullGeometryAlgorithm::groupId() const
   return QStringLiteral( "vectorgeometry" );
 }
 
+QgsProcessingAlgorithm::Flags QgsRemoveNullGeometryAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsRemoveNullGeometryAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
diff --git a/src/analysis/processing/qgsalgorithmremovenullgeometry.h b/src/analysis/processing/qgsalgorithmremovenullgeometry.h
index c93b42830c4..6eb53223261 100644
--- a/src/analysis/processing/qgsalgorithmremovenullgeometry.h
+++ b/src/analysis/processing/qgsalgorithmremovenullgeometry.h
@@ -34,6 +34,7 @@ class QgsRemoveNullGeometryAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsRemoveNullGeometryAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmrenamelayer.cpp b/src/analysis/processing/qgsalgorithmrenamelayer.cpp
index 396ffdfb741..b122d979f92 100644
--- a/src/analysis/processing/qgsalgorithmrenamelayer.cpp
+++ b/src/analysis/processing/qgsalgorithmrenamelayer.cpp
@@ -26,7 +26,7 @@ QString QgsRenameLayerAlgorithm::name() const
 
 QgsProcessingAlgorithm::Flags QgsRenameLayerAlgorithm::flags() const
 {
-  return FlagHideFromToolbox;
+  return FlagHideFromToolbox | FlagCanRunInBackground;
 }
 
 QString QgsRenameLayerAlgorithm::displayName() const
diff --git a/src/analysis/processing/qgsalgorithmsaveselectedfeatures.cpp b/src/analysis/processing/qgsalgorithmsaveselectedfeatures.cpp
index 3182667480e..1fe930c83ef 100644
--- a/src/analysis/processing/qgsalgorithmsaveselectedfeatures.cpp
+++ b/src/analysis/processing/qgsalgorithmsaveselectedfeatures.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsSaveSelectedFeatures::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsSaveSelectedFeatures::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterVectorLayer( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
diff --git a/src/analysis/processing/qgsalgorithmsaveselectedfeatures.h b/src/analysis/processing/qgsalgorithmsaveselectedfeatures.h
index 9a8c97d2399..f3c9af510ec 100644
--- a/src/analysis/processing/qgsalgorithmsaveselectedfeatures.h
+++ b/src/analysis/processing/qgsalgorithmsaveselectedfeatures.h
@@ -34,6 +34,7 @@ class QgsSaveSelectedFeatures : public QgsProcessingAlgorithm
   public:
 
     QgsSaveSelectedFeatures() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmsimplify.cpp b/src/analysis/processing/qgsalgorithmsimplify.cpp
index 1f4d1523189..2887417decc 100644
--- a/src/analysis/processing/qgsalgorithmsimplify.cpp
+++ b/src/analysis/processing/qgsalgorithmsimplify.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsSimplifyAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsSimplifyAlgorithm::name() const
 {
   return QStringLiteral( "simplifygeometries" );
diff --git a/src/analysis/processing/qgsalgorithmsimplify.h b/src/analysis/processing/qgsalgorithmsimplify.h
index 3028a238169..a716e8b7e33 100644
--- a/src/analysis/processing/qgsalgorithmsimplify.h
+++ b/src/analysis/processing/qgsalgorithmsimplify.h
@@ -35,6 +35,7 @@ class QgsSimplifyAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsSimplifyAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmsmooth.cpp b/src/analysis/processing/qgsalgorithmsmooth.cpp
index b13555d090d..ca1fbb93aa1 100644
--- a/src/analysis/processing/qgsalgorithmsmooth.cpp
+++ b/src/analysis/processing/qgsalgorithmsmooth.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsSmoothAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsSmoothAlgorithm::name() const
 {
   return QStringLiteral( "smoothgeometry" );
diff --git a/src/analysis/processing/qgsalgorithmsmooth.h b/src/analysis/processing/qgsalgorithmsmooth.h
index 6a884543b58..fc9f86069dc 100644
--- a/src/analysis/processing/qgsalgorithmsmooth.h
+++ b/src/analysis/processing/qgsalgorithmsmooth.h
@@ -34,6 +34,7 @@ class QgsSmoothAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsSmoothAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmsnaptogrid.cpp b/src/analysis/processing/qgsalgorithmsnaptogrid.cpp
index aefdfe9b18d..95092e1808c 100644
--- a/src/analysis/processing/qgsalgorithmsnaptogrid.cpp
+++ b/src/analysis/processing/qgsalgorithmsnaptogrid.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsSnapToGridAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsSnapToGridAlgorithm::name() const
 {
   return QStringLiteral( "snappointstogrid" );
diff --git a/src/analysis/processing/qgsalgorithmsnaptogrid.h b/src/analysis/processing/qgsalgorithmsnaptogrid.h
index 50cf1ae68f2..290815f8f73 100644
--- a/src/analysis/processing/qgsalgorithmsnaptogrid.h
+++ b/src/analysis/processing/qgsalgorithmsnaptogrid.h
@@ -34,6 +34,7 @@ class QgsSnapToGridAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsSnapToGridAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmsplitwithlines.cpp b/src/analysis/processing/qgsalgorithmsplitwithlines.cpp
index fcc5acdcfe3..b8bb476ae3f 100644
--- a/src/analysis/processing/qgsalgorithmsplitwithlines.cpp
+++ b/src/analysis/processing/qgsalgorithmsplitwithlines.cpp
@@ -45,6 +45,11 @@ QString QgsSplitWithLinesAlgorithm::groupId() const
   return QStringLiteral( "vectoroverlay" );
 }
 
+QgsProcessingAlgorithm::Flags QgsSplitWithLinesAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsSplitWithLinesAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ),
diff --git a/src/analysis/processing/qgsalgorithmsplitwithlines.h b/src/analysis/processing/qgsalgorithmsplitwithlines.h
index 23d98466f80..86f3b4655a1 100644
--- a/src/analysis/processing/qgsalgorithmsplitwithlines.h
+++ b/src/analysis/processing/qgsalgorithmsplitwithlines.h
@@ -35,6 +35,7 @@ class QgsSplitWithLinesAlgorithm : public QgsProcessingAlgorithm
   public:
 
     QgsSplitWithLinesAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmstringconcatenation.cpp b/src/analysis/processing/qgsalgorithmstringconcatenation.cpp
index 9bc55b7ea7e..3ec410b6d5d 100644
--- a/src/analysis/processing/qgsalgorithmstringconcatenation.cpp
+++ b/src/analysis/processing/qgsalgorithmstringconcatenation.cpp
@@ -26,7 +26,7 @@ QString QgsStringConcatenationAlgorithm::name() const
 
 QgsProcessingAlgorithm::Flags QgsStringConcatenationAlgorithm::flags() const
 {
-  return FlagHideFromToolbox;
+  return FlagHideFromToolbox | FlagCanRunInBackground;
 }
 
 QString QgsStringConcatenationAlgorithm::displayName() const
diff --git a/src/analysis/processing/qgsalgorithmsubdivide.cpp b/src/analysis/processing/qgsalgorithmsubdivide.cpp
index ca4cf9419d1..b55a2dba77d 100644
--- a/src/analysis/processing/qgsalgorithmsubdivide.cpp
+++ b/src/analysis/processing/qgsalgorithmsubdivide.cpp
@@ -20,6 +20,11 @@
 ///@cond PRIVATE
 
 
+QgsProcessingAlgorithm::Flags QgsSubdivideAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsSubdivideAlgorithm::initParameters( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterNumber( QStringLiteral( "MAX_NODES" ), QObject::tr( "Maximum nodes in parts" ), QgsProcessingParameterNumber::Integer,
diff --git a/src/analysis/processing/qgsalgorithmsubdivide.h b/src/analysis/processing/qgsalgorithmsubdivide.h
index bafa370e901..31843c634bc 100644
--- a/src/analysis/processing/qgsalgorithmsubdivide.h
+++ b/src/analysis/processing/qgsalgorithmsubdivide.h
@@ -34,6 +34,7 @@ class QgsSubdivideAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsSubdivideAlgorithm() = default;
+    Flags flags() const override;
     void initParameters( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmtransect.cpp b/src/analysis/processing/qgsalgorithmtransect.cpp
index 86582cfa3bc..4e2e643f70b 100644
--- a/src/analysis/processing/qgsalgorithmtransect.cpp
+++ b/src/analysis/processing/qgsalgorithmtransect.cpp
@@ -46,6 +46,11 @@ QString QgsTransectAlgorithm::groupId() const
   return QStringLiteral( "vectorgeometry" );
 }
 
+QgsProcessingAlgorithm::Flags QgsTransectAlgorithm::flags() const
+{
+  return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 void QgsTransectAlgorithm::initAlgorithm( const QVariantMap & )
 {
   addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ),
diff --git a/src/analysis/processing/qgsalgorithmtransect.h b/src/analysis/processing/qgsalgorithmtransect.h
index 7593f68186a..1d3efa5c07a 100644
--- a/src/analysis/processing/qgsalgorithmtransect.h
+++ b/src/analysis/processing/qgsalgorithmtransect.h
@@ -43,6 +43,7 @@ class QgsTransectAlgorithm : public QgsProcessingAlgorithm
       Both
     };
     QgsTransectAlgorithm() = default;
+    Flags flags() const override;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
     QString name() const override;
     QString displayName() const override;
diff --git a/src/analysis/processing/qgsalgorithmtransform.cpp b/src/analysis/processing/qgsalgorithmtransform.cpp
index 3454b1963f4..794fdae4237 100644
--- a/src/analysis/processing/qgsalgorithmtransform.cpp
+++ b/src/analysis/processing/qgsalgorithmtransform.cpp
@@ -35,6 +35,11 @@ QString QgsTransformAlgorithm::outputName() const
   return QObject::tr( "Reprojected" );
 }
 
+QgsProcessingAlgorithm::Flags QgsTransformAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsTransformAlgorithm::name() const
 {
   return QStringLiteral( "reprojectlayer" );
diff --git a/src/analysis/processing/qgsalgorithmtransform.h b/src/analysis/processing/qgsalgorithmtransform.h
index 6b41b9ae38f..af5cece1072 100644
--- a/src/analysis/processing/qgsalgorithmtransform.h
+++ b/src/analysis/processing/qgsalgorithmtransform.h
@@ -34,6 +34,7 @@ class QgsTransformAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsTransformAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;
diff --git a/src/analysis/processing/qgsalgorithmtranslate.cpp b/src/analysis/processing/qgsalgorithmtranslate.cpp
index dc98e86e5af..c6d7818e8f4 100644
--- a/src/analysis/processing/qgsalgorithmtranslate.cpp
+++ b/src/analysis/processing/qgsalgorithmtranslate.cpp
@@ -19,6 +19,11 @@
 
 ///@cond PRIVATE
 
+QgsProcessingAlgorithm::Flags QgsTranslateAlgorithm::flags() const
+{
+  return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
+}
+
 QString QgsTranslateAlgorithm::name() const
 {
   return QStringLiteral( "translategeometry" );
diff --git a/src/analysis/processing/qgsalgorithmtranslate.h b/src/analysis/processing/qgsalgorithmtranslate.h
index 99a1edc15dc..1a5932e7e97 100644
--- a/src/analysis/processing/qgsalgorithmtranslate.h
+++ b/src/analysis/processing/qgsalgorithmtranslate.h
@@ -34,6 +34,7 @@ class QgsTranslateAlgorithm : public QgsProcessingFeatureBasedAlgorithm
   public:
 
     QgsTranslateAlgorithm() = default;
+    Flags flags() const override;
     QString name() const override;
     QString displayName() const override;
     QStringList tags() const override;