How to make the Aether 2 mod for Minecraft 1.6.2 run smoother and faster?

I play it on a Dell laptop with 4 GB of RAM. I can play Minecraft with the mod but the game is incredibly choppy and slow whenever I run it on the account for Forge Modloader. On my normal account the game is perfectly smooth and has no lag. What can I do to make the Aether run smoothely with no lag like normal? I have tried Game Booster but that doesn't really help.

Added (1). I don't want to put my information on a sketchy survey to download, anything else please?

Samurai Sam

I can't believe that you haven't heard of OptiFine, it is a small mod for minecraft which alters the way in which the game loads and runs, and for most people it has a 200%+ increase in FPS (frame per second) it is the best way to reduce lag. If you haven't tried it already turn some video settings down (lower the render distance, turn smooth lighting off and set graphics to fast rather than fancy)

Guest