I spent a month tearing my hair out because my computer suddenly started running like shit and I couldn't even play trash games anymore and it seemed like no matter what I did, no matter how many optimizes I did or virus scans, it felt like it was intentionally running caping everything at a 10 fps.

Then in desperation I unplugged by laptop to see if there was any battery consumption settings effecting it and I figured it out. So it turns out Dell handicaps your CPU usage if you do not have the correct cable plugged in, ie if your power cable is old and worn out it will not recognize it as an official cable. So a month of driving myself insane when the solution was to unplug and press the cable in firmly until it recognized it.

But otherwise it seems like something hardware related is failing, computer shit sucks dealing with