Why Is My Computer Running Slow

I think there related but when i type every 45 seconds or so the writing types real slow and then speeds up again after about 15, also i found out while playing a game that if i click while it is going this slow, my computer will beep as many times as a click when it speeds up agian.
also. i bearly have any processes, i got dell inspiron 1501 and this only started happening recently.

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