I've been searching for a problem I have been having, and came across a thread, explaining the exact symptoms of the problems I've been having. So I'm just going to copypaste the details from that thread.
This is the original thread: Random CPU spikes and performance lag
-My computer is getting random performance lags that last 3-5 seconds.
-The cpu usage will jump when it happens; anywhere from 50-100%
-It's completely random and is very hard to catch but it happens when I'm:
a. browsing the internet with only firefox open; engaging in miniscule internet activities.
b. watching a youtube video at any pixel size.
c. playing a software intensive game.
-Computer slows but doesn't freeze
-the really bad spikes are up to 100% cpu usage; usually though they are 70-80%.
-Video sound gets distorted and choppy; like if you have an injured CD that still plays right through the scratches but gets all choppy sounding.
-often times the mouse pointer will, all of the sudden, be trailing during the strange slow motion performance lag.
-Happens offline as well, so it's defiantly not the Internet.
As with the other thread, these are the fixes I've tried as well:
fixes I've tried:
-Cleaned out entire case fans, vents, cpu heatsink.
-disabled home network
-made sure all drivers
were up to date for everything in my computer
-ran malwarebytes and also my av of course