I have a large list box -- probably 7500 items (no it's not an option to reduce the size currently). I recently updated the page to use ajax 1.0 to refresh the loading. As soon as I put the load/listbox within the update panel, things came to a crawl. Most of the time it freezes the page and IE crashes.
Without the update panel, allowing the entire page to refresh (headers, footers, navigation, etc) -- the page loads in around 500ms (trace from DB puts the sql loads at around 20ms). When I simply put an update panel around the load everything stops.
Here's my scenario:
On the page i have a grid w/ approximately 100 users on the left side...when you click on a user within the grid...i refresh the update panel w/ the listbox populating the available/selected security options. There are 7500 options. Without the update panels this takes 500ms, with the update panels the first edit selection loads imediatel ...
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