[QGIS-Developer] Short freezes during panning map

[Simon Gröchenig]

Hi developers,

happy New Year!


A customer is working with a QGIS project (which I cannot share in public) 
with many layers. Panning/Moving to an location outside the current extent 
triggers short (0,5-1 sec) freezes.

Using the project with the old 3.16 version is working without freezes 
during panning the map.

Using the project with a current version (3.30 or greater) results in short 
freezes.

I would like to ask for some ideas on what could trigger those short 
freezes during panning the map? I guess reading the map data and painting 
the map is done in a background thread.

Best regards
Simon