https://www.youtube.com/watch?v=Y65wuyoImKI
The Elder Scrolls IV Oblivion Remastered Steam Deck FPS Boost Performance Mod Install Setup Guide - Increase FPS, Reduce Stuttering, Improve Input Latency, Disable Lumen Ray Tracing, Improve Performance on the Steam Deck, Windows, Windows Handhelds and Linux.
I haven’t bought the game yet, but I’ve been told this guy’s setting list on ProtonDB is supposed to help a lot.
Also apparently changing graphics options on the game leads often leads to bad performance issues for that session. After changing settings, if it seems like the game is running worse, you will likely need to restart the game to see how well it will actually run with the new settings.
Link directly to their settings: https://www.protondb.com/app/2623190#oUuf0fxasv