I found that on my mac, the normal launcher runs 80-100 fps and then only goes 17-50 fps. When my computer drops to 17 fps I get a jello feeling with my mouse when I try to move. This can be remedied by going full screen and the fps drops go away. The game was not playable when I only had 1gb of ram allocated but fullscreen still worked for some reason. I also had my mac's intel graphics card on and switched to my 500mb one and did not notice fullscreen fps change much.