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The geometry cache was only used for few geometry editing operations anyway. In earlier versions of QGIS the geometry cache was also used by old snapping classes which have been replaced by QgsPointLocator that also keeps a spatial index of geometries and it is not rebuilt on every re-render. Reasons for removal: - geometry cache was repopulated on every redraw of layers in editing mode, slowing down rendering - data structure for the cache was a simple map with features accessed by their ID (no spatial index) - the cache was only getting refreshed for the current view of the main map canvas (not a generic cache) - not used for snapping anymore where caching was important to avoid roundtrips to data provider