If you are experience flickering in apps and your windowing system is Wayland, there is likely a fix coming this month in the next NVIDIA patch. And, Gnome and KDE either already have or are working on their side. Here’s a good jumping off point to understand why Nvidia support for Linux is essentially incomplete until this gets flowed out to all users: www.phoronix.com/…/Explicit-GPU-Sync-XWayland-Go
Gamescope is a Valve thing that is also related, helps make stuff work on Linux