diff --git a/src/app/qgisapp.cpp b/src/app/qgisapp.cpp
index 635220a3f8d..4c39ae39017 100644
--- a/src/app/qgisapp.cpp
+++ b/src/app/qgisapp.cpp
@@ -3572,7 +3572,7 @@ QgsMapCanvasDockWidget *QgisApp::createNewMapCanvasDock( const QString &name )
   {
     if ( canvas->objectName() == name )
     {
-      QgsDebugMsg( tr( "A map canvas with name '%1' already exists!" ).arg( name ) );
+      QgsDebugMsg( QStringLiteral( "A map canvas with name '%1' already exists!" ).arg( name ) );
       return nullptr;
     }
   }
@@ -10687,7 +10687,7 @@ Qgs3DMapCanvasDockWidget *QgisApp::createNew3DMapCanvasDock( const QString &name
   {
     if ( canvas->objectName() == name )
     {
-      QgsDebugMsg( tr( "A map canvas with name '%1' already exists!" ).arg( name ) );
+      QgsDebugMsg( QStringLiteral( "A map canvas with name '%1' already exists!" ).arg( name ) );
       return nullptr;
     }
   }
diff --git a/src/core/qgsvirtuallayertask.cpp b/src/core/qgsvirtuallayertask.cpp
index 504a0733afa..8ebca0b7a01 100644
--- a/src/core/qgsvirtuallayertask.cpp
+++ b/src/core/qgsvirtuallayertask.cpp
@@ -36,7 +36,7 @@ bool QgsVirtualLayerTask::run()
   }
   catch ( std::exception &e )
   {
-    QgsDebugMsg( tr( "Reload error: %1" ).arg( e.what() ) );
+    QgsDebugMsg( QStringLiteral( "Reload error: %1" ).arg( e.what() ) );
     rc = false;
   }
   return rc;
diff --git a/src/providers/ogr/qgsogrdataitems.cpp b/src/providers/ogr/qgsogrdataitems.cpp
index 6e9d1446d0a..7e9ae740b99 100644
--- a/src/providers/ogr/qgsogrdataitems.cpp
+++ b/src/providers/ogr/qgsogrdataitems.cpp
@@ -166,7 +166,7 @@ QList<QgsOgrDbLayerInfo *> QgsOgrLayerItem::subLayers( const QString &path, cons
   QgsVectorLayer layer( path, QStringLiteral( "ogr_tmp" ), QStringLiteral( "ogr" ) );
   if ( ! layer.isValid( ) )
   {
-    QgsDebugMsgLevel( tr( "Layer is not a valid %1 Vector layer %2" ).arg( path ), 3 );
+    QgsDebugMsgLevel( QStringLiteral( "Layer is not a valid %1 Vector layer %2" ).arg( path ), 3 );
   }
   else
   {
diff --git a/src/providers/wcs/qgswcsprovider.cpp b/src/providers/wcs/qgswcsprovider.cpp
index fd8dfba85ee..13fbcaf2797 100644
--- a/src/providers/wcs/qgswcsprovider.cpp
+++ b/src/providers/wcs/qgswcsprovider.cpp
@@ -546,9 +546,9 @@ void QgsWcsProvider::readBlock( int bandNo, QgsRectangle  const &viewExtent, int
     {
       // Rotate counter clockwise
       // If GridOffsets With GeoServer,
-      QgsDebugMsg( tr( "Rotating raster" ) );
+      QgsDebugMsg( QStringLiteral( "Rotating raster" ) );
       int pixelSize = QgsRasterBlock::typeSize( dataType( bandNo ) );
-      QgsDebugMsg( QString( "pixelSize = %1" ).arg( pixelSize ) );
+      QgsDebugMsg( QStringLiteral( "pixelSize = %1" ).arg( pixelSize ) );
       int size = width * height * pixelSize;
       void *tmpData = malloc( size );
       if ( ! tmpData )
@@ -1896,7 +1896,7 @@ void QgsWcsDownloadHandler::cacheReplyProgress( qint64 bytesReceived, qint64 byt
 {
   Q_UNUSED( bytesReceived );
   Q_UNUSED( bytesTotal );
-  QgsDebugMsgLevel( tr( "%1 of %2 bytes of map downloaded." ).arg( bytesReceived ).arg( bytesTotal < 0 ? QString( "unknown number of" ) : QString::number( bytesTotal ) ), 3 );
+  QgsDebugMsgLevel( QStringLiteral( "%1 of %2 bytes of map downloaded." ).arg( bytesReceived ).arg( bytesTotal < 0 ? QString( "unknown number of" ) : QString::number( bytesTotal ) ), 3 );
 }
 
 void QgsWcsDownloadHandler::canceled()
diff --git a/src/providers/wfs/qgswfsrequest.cpp b/src/providers/wfs/qgswfsrequest.cpp
index 420a4ceb64f..88edee67011 100644
--- a/src/providers/wfs/qgswfsrequest.cpp
+++ b/src/providers/wfs/qgswfsrequest.cpp
@@ -209,7 +209,7 @@ void QgsWfsRequest::abort()
 
 void QgsWfsRequest::replyProgress( qint64 bytesReceived, qint64 bytesTotal )
 {
-  QgsDebugMsg( tr( "%1 of %2 bytes downloaded." ).arg( bytesReceived ).arg( bytesTotal < 0 ? QString( "unknown number of" ) : QString::number( bytesTotal ) ) );
+  QgsDebugMsg( QStringLiteral( "%1 of %2 bytes downloaded." ).arg( bytesReceived ).arg( bytesTotal < 0 ? QString( "unknown number of" ) : QString::number( bytesTotal ) ) );
 
   if ( bytesReceived != 0 )
     mGotNonEmptyResponse = true;
diff --git a/src/providers/wms/qgswmsprovider.cpp b/src/providers/wms/qgswmsprovider.cpp
index 6e25f8f8676..84fd96f16ee 100644
--- a/src/providers/wms/qgswmsprovider.cpp
+++ b/src/providers/wms/qgswmsprovider.cpp
@@ -323,7 +323,7 @@ bool QgsWmsProvider::addLayers()
   Q_FOREACH ( const QString &layer, mSettings.mActiveSubLayers )
   {
     mActiveSubLayerVisibility[ layer ] = true;
-    QgsDebugMsg( "set visibility of layer '" + layer + "' to true." );
+    QgsDebugMsg( QStringLiteral( "set visibility of layer '%1' to true." ).arg( layer ) );
   }
 
   // now that the layers have changed, the extent will as well.
@@ -1326,7 +1326,7 @@ bool QgsWmsProvider::extentForNonTiledLayer( const QString &layerName, const QSt
   QgsCoordinateTransform xform( wgs, dst );
   Q_NOWARN_DEPRECATED_POP
 
-  QgsDebugMsg( QString( "transforming layer extent %1" ).arg( extent.toString( true ) ) );
+  QgsDebugMsg( QStringLiteral( "transforming layer extent %1" ).arg( extent.toString( true ) ) );
   try
   {
     extent = xform.transformBoundingBox( extent );
@@ -1336,7 +1336,7 @@ bool QgsWmsProvider::extentForNonTiledLayer( const QString &layerName, const QSt
     Q_UNUSED( cse );
     return false;
   }
-  QgsDebugMsg( QString( "transformed layer extent %1" ).arg( extent.toString( true ) ) );
+  QgsDebugMsg( QStringLiteral( "transformed layer extent %1" ).arg( extent.toString( true ) ) );
 
   //make sure extent does not contain 'inf' or 'nan'
   if ( !extent.isFinite() )
@@ -3703,7 +3703,7 @@ void QgsWmsImageDownloadHandler::cacheReplyProgress( qint64 bytesReceived, qint6
 {
   Q_UNUSED( bytesReceived );
   Q_UNUSED( bytesTotal );
-  QgsDebugMsg( tr( "%1 of %2 bytes of map downloaded." ).arg( bytesReceived ).arg( bytesTotal < 0 ? QString( "unknown number of" ) : QString::number( bytesTotal ) ) );
+  QgsDebugMsg( QStringLiteral( "%1 of %2 bytes of map downloaded." ).arg( bytesReceived ).arg( bytesTotal < 0 ? QString( "unknown number of" ) : QString::number( bytesTotal ) ) );
 }
 
 void QgsWmsImageDownloadHandler::canceled()