Why is my pc lagging so much?

[Miro Paasisalo]

I have an Nvidia 2060 super, 16 gb ddr4 ram. Im running windows 11, my antivirus app cant find anything, my graphic card drivers are up to date. But as soon i start for example Rainbow six siege, its absolutely unplayable, im getting like +/- 10 fps, and sometimes 60. I had previously played easily 120+ fps with very good graphics. I have a lot space on my ssd cards. It played games like red dead redemption 2 with very good graphics easily, and almost got to play every game +120 fps.

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