I downloaded a mod for Minecraft and now my computer is running terribly.

[Windows 11]

I downloaded a mod for Minecraft and now my computer is running so bad, I used to get 100-160fps on rust now it’s at only 60-50. Most games that I play constantly screen tear or freeze up to 10 seconds or just completely freeze and I am forced to power off my computer. I deleted the files I downloaded that day and uninstalled them and also ran a scan for viruses or malware but nothing is working, after the scan the computer sorta worked better but it’s still runs terrible, I need help please, (btw the “mod” was optifine). The computer works perfectly fine when I’m not on a game, so if I’m on a

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