That would be disable rendering Czar. Low CPU mode reduces the FPS to 17 or 20, I don't remember which. Only works on Injection as Czar said. Advantage is lower CPU usage, disadvantage is most scripts and mostly the default interaction API behavior doesn't really work well on lower FPS, mainly noticeable at the lower FPS of 3-5. But since Low CPU mode doesn't lower it that low, you'll probably see a few more miss click/failed interactions. Great for afkish tasks, situational in activities like combat.