Please note that it takes time to investigate this issue, this problem is not common, and any help provided is voluntary while we also do have a job ourselves.
Also beware of timezone differences. I do not know where you live, and that's none of my business, but if you live in any timezone of, for example, the USA then I can tell you that I'll be long asleep when it gets evening in the USA.
What exactly do you mean with your computer starts running slowly, what do you see/notice?