WHOA. THAT'S A LOTTA FRAMES. Even without Optifine, I'm getting like 150 FPS on my old worlds. Yeah; I don't care if I can't play at night anymore; i'm not going back to trying Minecraft on my Linux laptop. xD
My Linux laptop gets like 6 FPS with everything on the VERY minimum settings. Dunno if Optifine will help any. xD The graphics card on that thing is not good at all. =P