Without Keyclone(Or even with, per-window), type /console maxfps ##, replacing the #s with the number you want, such as /console maxfps 35; to set the max FPS while the window is NOT the FRONT window(Including when tabbing to non-wow programs like IRC), type /console maxfpsbk ##, replacing ## with the number you want, preferably LOWER than your normal maxfps; I use 35 maxfps when I do use maxfps, and I leave maxfpsbk on 20 or 25 and see little issue lagwise outside of shatt near the FP where there's thousands of fucking laggy idling arena sluts on their knees for welfare epics lol