Should add that every Intel CPU since the Pentium 4 has speed stepping tied to thermals. If there is enough dust/cat dander/dog hair in the case to carpet the heatsink, the CPU will shut off half its cores AND/OR run at half speed (out of self-preservation). If your PC is significantly slower than it used to be, yet you're not getting the browser hijacks indicative of a virus, crack open the case and vacuum it out. Really important to do this every 6-9 months if you have pets or hardwood floors.
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