When I toggle the editing mode QGIS freezes. The layer is stored in PostGIS. I'm using QGIS 3.10.
1 Answer
It appears that the snapping option (Project > snapping options) was set to "all layers". One of the vector layer is an ESRI ArcGIS Feature Server. QGIS tries to create an index on this huge layer, it is the indexing which makes QGIS freeze.
Solution Disable the snapping or avoid the snapping on this layer.