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#101
It is entirely possible that your CPU is being throttled back when it reaches a certain temp the coolsoff and then speeds back up again.
Rig up some kind of hokey cooling like a fan blowing directly to the intake ports for the cooling and see if that helps.
MOST laptops do not do well for anything processor or GPU intensive for very long because they almost all have inadequet cooling
Sometimes those cooling pads can help if the holes line up and the airfow is the right direction (but they can hurt too if blowing air the wrong way or something)