After move from sai to krita for a week i found some problem here
1. Overview is super slow, everything i paint on the canvas appear on overview about 2 sec after
2. When i turn on/off layer visible keyboard shortcut is disable for ~1 sec
3. Editing opacity layer not result instantly on the canvas. For example : moving the opacity bar up and down continuously and nothing happen until stop for a bit
I don't have any problem with brushes, it work perfectly !
My computer : i7-3480QM - quadro k2000m - 16gb ram - win7 64bit
Can someone recommend a older krita version on windows so i can test with it ? I love this program

hmm. does it make any difference if you try to turn off OpenGL?

Settings > Display > turn off the open GL checkbox.

That causes issues sometimes. It is possible that an older OpenGL driver could be causing it

thank you
but turn OpenGL off make things worse on my pc and my graphic card driver is up to date

looking at your issues deeper, it might just be some delays that could be improved. Sometimes with painting and the canvas, OpenGL creates issues. You have very specific issues with features.

You can try with older versions of krita and see if it works any better. Krita 3.0 had a lot of big changes, so you could try 2.9.11

https://files.kde.org/krita/windows/

Thank a lot krita 2.9.11 work very fast