I have no idea why this is happening but it has been happening in every game I play (elden ring and BF1 recently).
Unless I have my firefox browser open on my 3rd monitor, my performance is completely [language redacted] (literally 30% of the usual FPS)
Just tested with BF1 and my fps went from...
I pressed the red switch behind my power supply while everything was plugged and powered, PC wasn't on. The electrical socket busted and we turned it back on. Also there was a yellow flash in the power supply. How f**ked am i?