We have an UpdatePanel that contains a gridview that may have 1000 rows. This can take a long time to render, and by working with MS support we've confirmed that the data retrieval is quick, but it is the rendering of the page in the browser that is slow.
The UpdateProgress control associated with the panel contains an animated gif. The gif moves (it looks like a rotating wheel) while the data is being retrieved and bound to the grid, but while the page is being rendered in the browser it stops. This is confusing to the users as they think something is wrong.
Any ideas about how to keep the UpdateProgress moving?
