[ubuntu] Ubuntu 11.10 32-bit running very slow and hot!

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http://ubuntuforums.org – I recently installed Ubuntu 11.10 32-bit on my Macbook Pro 6.2. For the first few days it ran fine, a little hot, but nothing too bad. I watched a movie today and when it finished my machine began running slower than I've ever seen on any computer. The trackpad and Unity Launcher worked fine but anything I did within an application took about a minute to take effect. Also applications became unresponsive for no apparent reason. I'm new to Ubuntu so it's probably just a noob mistake. Could it be that I'm running 32-bit? Or, did I not install something? Thanks for your help! (Hardware)