Probably shit compiling on your computer.
And thats why i reinstalled my OS every 6 months.
Make sure there aren't unusual processes running. check the task manager.... assuming you know most of your common process names, you should be able to find some uncommon process there .
Close processes,
Update drivers, (gpu,netcard,mobo etc)
Use vaccum cleaner to clean dust (useful bro)
Unplug yar cables if u go to sleep.
Don't use any booster, (they use more cpu than the processes that they shut down)