GWT MouseOver performance

I'm writing an application in GWT. It went really well, until I ran it in IE.

I made an application that uses a FlexTable, and each cell of the table was to be highlighted. I wrote the MouseOver handler, but in the开发者_运维技巧 Internet Explorer it works incredibly slow.

Is there anything I can do about it?

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FlexTable's performance kinda sucks in IE (BTW, which version of GWT are you using?), because of the DOM methods needed there to create the table. However, Grid should provide you with a nice boost in performance, if the size of your table is constant and known beforehand and you don't need jagged tables (otherwise you can't even use it :)).
A compromise between the two would be one of the tables from GWT's Incubator - for example ScrollTable has support for mouseovers straight out of the box and BulkTableRenderers should speed up the creation of your table (there's even a version for FlexTable). Even if you are not interested in using them in production, it might be worth checking out, for example, how they implemented MouseOver events on IE.