Yes. Clean it out and try again.
Also have a look at Windows Task Manager to see if any unnecessary processes are slowing you down.
In terms of processes I don't think anything is running that creates any problems, I also use Razer Game Booster and that doesn't change anything at all. It definitely seems like a heating issue
By clean it out, you mean open it up and clean out the dust right? ._. this is gonna be hard, the thing is shut tight like crazy and I don't know a thing about cleaning, is there some test I could run or something?