We've just spent a month integrating Dojo throughout our large technical application... but at the eleventh hour, we have run into a showstopper issue with DataGrid and QueryReadStore: it's *unacceptably* slow, for no obvious reason.

For example, the first HTTP request to our Web service to fetch the first 100 rows (just 5 columns) usually takes 7 seconds. That is, the HTTP request alone takes around 7 seconds, and then there is a several-second lag after that before Dojo renders the rows. After that, HTTP requests typically take 6 to 17 seconds.