Dolphin became slow after some days of use. What could it be?

[kuro kitsune]

Already tried with Direct3D9... and it's the same, 50%~ 15FPS...
And I could play with a moderate resolution in the beggining, the problem doesn't seems to be in the emulator settings...

I'll try using Windows 7... that's really sad 'cause I didn't want to lose my "Free" Win8 hahahaha... but I don't see other thing that could be the source of this problem...

I'm thinking in buy a cooling pad too... do you think it's a good idea?!? Or will not do any difference???