Comment 4 for bug 1940836

Same issue for me using latest stable NVidia drivers on 20.04 with latest 7.2 Libre office snap.

I've noticed that only Calc is affected. Impress and Writer are not affected.

So there must be some calc specific graphics acceleration method causing high CPU rendering load.

Unlike the orig bug report, what worked for me was removing the snap and reverting to old deb `sudo apt install libreoffice` back to 6.4.7.2 non-snap version. No rendering performance issues with the older deb package.

https://ask.libreoffice.org/t/calc-and-writer-ver-7-0-are-extremely-slow/58522/8 mentions trying this which I tried with the 7.2 snap version:

SAL_USE_VCLPLUGIN=gen libreoffice

It seemed to work better but still somewhat slow and not nearly as responsive as the 6.4 deb package.