I usually play starcraft 2 and I always get low fps(30~35). So I checked my cpu and gpu usage and they were around 50% and i was running at full settings in starcraft 2 at that time.
I lower resolution from 1600x900 to 1024x768 and It did not change the framerate and the cpu/gpu usuage. I also lowered the settings and the framerate hardly changed.
The cpu/gpu usage were at around 50% in full settings in starcraft 2.***