Hi Andreas, and thank you for your answer. In fact, I don't use the XFCE compositor, but Compton instead.
When I experienced the problem, I tried to disable it to see if it made a difference, but it was extremely minimal: windows movement were slightly less jerky, and OpenGL games were still unplayable or crashing.
Since it made no difference, I doubt it is usefull, but here is the command I'm using to start Compton : __GL_THREADED_OPTIMIZATIONS=0 compton --backend glx --paint-on-overlay --glx-no-stencil --glx-no-rebind-pixmap --vsync opengl-swc
I've installed KDE Plasma 5 and gave it a try, and it looks like all was running smoothly. So it may not be a nvidia-driver problem, but something related to XFCE (or my settings of it).
Regards.
