A lot of those new Unreal Engine “technologies” are quite terrible for the framerate. They try to make unoptimized scenes bearable, but traditional optimization techniques are so much faster, and adding Lumen/Nanite whatever on top just slows things down again.
Highly recommend this mod / .INI fix for Steam Deck (and all systems honestly).
The forced Lumen tanks frame rates even on my 5080.
A lot of those new Unreal Engine “technologies” are quite terrible for the framerate. They try to make unoptimized scenes bearable, but traditional optimization techniques are so much faster, and adding Lumen/Nanite whatever on top just slows things down again.