Lag Spikes, and CPU Usage Spikes!

Rhyme_60

Honorable
Aug 18, 2012
2
0
10,510
Well, I play Grand Theft Auto San Andreas, and I've been dealing with FPS lag spikes.
I used to get good FPS before, and now I all of a sudden get lag spikes.
Like, for around 20 seconds or more.
I don't know if it's my CPU or whatever.
'Cause as soon as it happens I check my task manager and the CPU had spiked.
So, Idk if it's heat, it probably is, because I am expecting to de-dust my computer.
That should solve it, but I'd like to know any other possible reasons.
Or maybe ways to calm it down for a short while.
Please help.