[ubuntu] Everything is slow

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http://ubuntuforums.org – I am currently using Ubuntu 11.10 with GNOME classic interface. Whenever I try to open anything it's very slow. Ubuntu software centre takes almost 1 minute to start. Firefox takes about 35 seconds and thunderbird takes around a minute. I have a laptop with 2 GB RAM and I think that's sufficient to run it normally. But everything is quite fast with Unity interface. (Hardware)