large data loading problems (not using XML)

Hi,
I have a large data set that I want to load into a TreeGrid however I am having a lot of performance issues.

I am gathering my data out of a database and loading it into the TreeGrid in a for loop using mygrid.addRow this works great for small data sets. However with a dataset of over 1000 it bombs out.

Is there anyway to stop this?
Cheers

Nic

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