lag help

[limpid hearth]

I don't know if this is where I should be asking this or if this is a me thing or not, but I play on pc and have played for 50 hours with the same settings but I just went into the game and it suddenly got very laggy and its not really playable. this has never happened I usually average 100-120 fps and I've never changed my settings, on every other game I play its completely fine, I've restart my pc 3 times and idk what to do anymore, I tried seeing if anything in settings changed but there all normal

[spring surge]

Have you verified the game files? (library, right click game, properties, local files, verify integrity of game files)

[barren epoch]

in video settings there's something like anti anealising or sth like that. turn that to low