[ubuntu] 12:10 slow to respond

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http://ubuntuforums.org – Just downloaded it , I like it a lot but when I left click something it takes a few seconds to respond. Is this fixable or do you have any thought on this. Once it responds to the left click it doesn't seem to stall. When I get to many programs up I have a hard time closing programs I hit the x over and over and nothing happens. (Hardware)