I'll tell you right away that i'm not need this for speedruns, only for challenge. I want to complete the game on 100% several times and each time i want to speed game up by like 0.5 or 1.0 x. I've tried to find any useful information but i can only do like 1.5x with 144 fps cap (and that's not fast enough) or that a chance to do what i want but only at ps2 emulator and i really don't want to control the camera with stick on a high speed. Do someone have any ideas how to perform that on pc?

There was a time when I tried something similar. Back then I think I used Bandicam to lock / unlock fps when needed so you can try that to play game faster.