Tweaking SteamOS For Better Steam Deck Performance
In the case of Counter-Strike: Global offensive it helped raise the frame rates by a couple FPS on the Steam Deck, but not nearly as significant as the upgrade from SteamOS 3.4.
In other tested games like Cyberpunk 2077, HITMAN 3, and F1 22 there didn't end up being any real change in performance with these tweaks.
For very CPU bound workloads not too demanding on the GPU, the tweaks -- like switching to the performance governor -- did help in cases like the Unvanquished open-source first person shooter to achieve higher frame-rates.