[ubuntu] ubuntu 12.04 slow, freezing, etc.

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http://ubuntuforums.org – hello, i recently upgraded to 12.04 from an earlier version (8.10 or 9.10 i forgot) after doing a clean wipe and install. programs that i used previously are now performing very laggy, and when i multitask the computer will often totally freeze up. its not pleasant in its current state.. i was wondering if you guys know any way to "lighten" 12.04 so it works cleaner on my computer. thanks (Hardware)