Recently, I decided to dual boot Windows 7 with Ubuntu. Ubuntu's great. It's very fast and easy to use. The only problem I'm having at the moment is running Minecraft. See, Minecraft runs at a smooth 60-70 FPS, fast graphics + tiny render distance on Windows, but on Ubuntu, the FPS is capped at 30. The only mod I have installed at the moment is the Optifine mod, which boots the performance of Minecraft substantially. In the video options, I have the performance option set to "Max FPS" which is supposed to uncap the FPS. I'm really stumped here.
Here's my system specs, because I'm sure they'll help:
These specs are completely stock, by the way.
Model: ASUS Essentio CM5571-BR003
CPU: Intel Pentium dual core @ 2.70 GHz x2
GPU: Intel G43/G45 Express chipset
RAM: 6GB DDR3
Any help would be greatly appreciated.