[racket] drracket editor running too slow

I am having a problem with my drracket editor running extremely slow.  I am using ubuntu 10.10.  I downloaded the latest version of racket (5.1) I used to have (5.0).  Ever since then my editor is super slow.  I don't know if their is coincidence or the reason why.   For example, I try to highlight 3 lines of code in the drracket editor and it literally takes 6 seconds to finishing highlighting!(I click and drag the mouse).  If I hit enter say 20 times then it takes close to a minute to execute all of the enter commands.  The bottom part of running the program is fast, it is just the top part (editor) that is slow.  Does anyone know what the problem might be? 
 		 	   		  
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