Alienware M15x laggg out of nowhere...SCII + CSS

[sshwelan]

So recently my M15x has been lagging on two fronts, SCII and in CSS. It isn't terrible but when the graphics in SCII have become very intense, my comp cannot handle it whatsoever. Before, if the graphics became very complicated, the comp would lag a bit, the FPS would drop and whatnot but it wouldnt lag the way it does now where it appears as if the FPS is below 7. I installed the HWMonitor and it tells me that the CPU temps are above 75C when I am playing. Is this a very hot temperature to be running at? or is this the source of the problem. I feel that I do not need to list my CPU's specs due to the fact that it was fine a few weeks ago, and just recently the FPS are around 50 lower than where they were on average before. Could "vaccumming" out dust from around my fans solve this problem if it is due to overheating? And if it isn't overheating, what are your thoughts??

No my stealth mode is not on lol and this isnt an area51 either

Thanks in advance!