https://bugs.freedesktop.org/show_bug.cgi?id=109171
--- Comment #13 from Sherif ali.sherif10@yahoo.com --- I found that only CS: GO's main GUI is slow with AMD's GPU, but it's much faster during matches. On Intel's GPU, the main GUI's smooth, but there's some lag during matches. I tried the tutorial only.
On both cases, fullscreen was enabled.