I know this might seem like a ridiculous idea, but have you considered not using a celltable? I suspect you are getting a bottleneck while ie6 renders the table, therefore batching may not resolve the problem. I'm fairly new to GWT and have been experimenting with the ListEditor, and using it to maintain a list of widgets. As long as the editor widgets are kept lean, I've been getting fairly good performance even with large data sets. If you can draw the table, using DIVs instead of a TABLE, you might get the performance you need. The drawback is that you loss a lot of the grid functionality. I realise that this doesn't answer your question, but it might help.
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