How many are rendered on the screen at once?  If you have 50+ or 100+ on the 
screen, then I can see how this could slow down.  You might want to use 
paging like in the CwCellList sample.  From my experience, the expensive 
stuff is the rendering, so we try to minimize that as much as possible.  

http://code.google.com/p/google-web-toolkit/source/browse/trunk/samples/showcase/src/com/google/gwt/sample/showcase/client/content/cell/ShowMorePagerPanel.java?r=8511

Good luck,
m

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