Just about a day ago I turned my computer on and it was running really slow and the mouse cursor is lagging. Videos like on youtube run smoother then they ever have but only for about 3-4 seconds at a time but then stutter for about 2 seconds. So I'm guessing the performance of my computer was up'd without my knowledge and it can't handle it, maybe I did something and am unaware of it but I am not sure what. My questions are what caused this and how can I fix it please. I'm not particularly computer savvy so if you could please keep it simple.
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