MASSIVE Frame Drops

I’m struggling to diagnose the cause of in-game lag (FPS at a stuttery 15-30fps especially outdoors). Windowed/borderless/fullscreen switching makes no difference nor does resolution changes. Running the Linux version on steam deck and most importantly I’m running the legacy 1.5.6 beta branch to let me run my 250+ mods only noticed this lag since switching to that branch though can’t remember it it happened right away. Tried turning off legacy beta branch and just turning off steam deck wifi so game wouldn’t update and same fps issue. Also have Cryo Utilities but changed VRAM and other settings back to Stock and no change. Have taken away newer mods and no change. Tried the Profiler mod but can’t make sense of it…
 
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