FPS Drops
The FPS when I start CS GO is like 100 then it the middle of the game it goes to 70 then after that it sticks to 30-50 and keeps like that till I close the game . I am using a laptop , I know it's not so good but I used to play good before and I have not installed any programs and it starts well so wtf is this ?
Stop looking up porn, lower-settings,reformat computer,virus scan, good to go!
Maybe Overheating? Check your temps when you start getting horrible fps. I use Speedfan for it.