Step 1:

Going to Stalker2\Content\Paks\ and create folder "~mods"

Step 2:

Going to LINK>>[www.nexusmods.com] and download patch for CPU and GPU optimization "Optimazed Tweak Base v1.31", after unzip file to the folder ~mods

Going to LINK>>[www.nexusmods.com] and download patch for GPU and graphics optimization "Stalker Optimizer", after unzip file to the folder ~mods

Step 3:

Change launch option for the game in steam
-xgeshadercompile -nothreadtimeout -NoVerifyGC

Step 4

Start the game, change your overall quality in graphics options to different and save, after that restart the game and check your fps =)

My pc specs and graphics settings:

i9 9900k
aorus 2080 ti xtreme
32 gb ddr4 3600Mhz
ssd m2 samsung 970 evo plus 2 tb
2k 2560x1440

Custom High - Epic
DLSS - Ultra Performance
FSR 3 Framerate Generation - on