same thing happened to me, except it came up after updating to windows 1909. I've been having 200+ fps on cs:go and now it barley gets above 30 at times.
Hello!
I've recently updated my windows version to 1909 and have been having massive lag spikes since. I don't know what happened or what caused it but I tried a system reset (resetting everything other than my personal files) and nothing helped me so far. I've also been watching tutorials...