Guide that doesn’t require any third party installs.
Requirements
A Linux based OS and Steam
Game Properties
DXVK_FRAME_RATE=60 taskset -c 0-7 %command%
The first command limits the framerate to 60fps.
The second limits the core count to below 8 (this is necessary for the game to run with high core count CPUs).
Set the compatibility option to Proton Experimental
Extra Goodie
Staying Up to Date
Good for old games that are broken on Windows and/or don’t even launch.
I could never get this to work right on Windows 10 but it was pretty simple on Linux.
PCGW is useful for any PC gamer
Includes links to community patches and fixes.
https://www.pcgamingwiki.com/wiki/Prototype_2
Thanks to Aftonstjarna for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.