I had no problems playing on Faceit, but since I had to install anti cheat I was unable to play due to crazy fps drops. I can see fps drop even in CS:GO lobby menu. I have no idea what could fix this.
Please read this support article:
FPS drops/stutter when using the mouse and/or keyboard
This is likely caused by a file being blocked by the AC that is constantly trying to reload into the game, and thus cause stuttering. Your debug.log file in %appdata%/FACEIT/FACEIT Client will give you information about which file has been blocked. Read below about how to deal with blocked files.
This could also be caused by having -high in your Steam game launch options. It is not recommended to use this launch option, as it can mess up with the Windows process scheduler and cause some mouse lag issues for some people.
Please note: I’ve moved this thread to Community.