[QGIS-Developer] Qgis 3 raster caching

[Patrick Dunford]

Good day

As we all know, Qgis 3 has this new capability to cache raster layers. 
This seems to work quite well except if you have a lot of rasters, it 
seems to run out of steam after a while. When that happens, it causes 
all sorts of interesting outcomes with other layers randomly appearing 
and disappearing.

Is there any documentation or descriptions online somewhere of the 
intentions to be achieved with this capability that can allow for 
consideration of possible ways of addressing issues.