Suddenly ALL games began to lag. Help; ((Counter-Strike: Global Offensive)

I tried all the methods, downloaded the driver, downloaded Windows updates, Nvidia looked at all the parameters for optimization, looked at all the methods for viruses, looked at no miners, no viruses, help me pazhalusta

Here the screen



jumps sometimes to 80, basically it keeps 2.80 GHz, but for some reason it does not affect on fps