I\'ve recently ran into a bit of a pain. I\'ve been using the JQuery Dialog box to display some configuration screens in a web app. Nothing too special. However I have a cou
2 seconds sounds a lot better, but you'll probably find it is very much dependent on the users browser and system config - it might be much worse on a slower system in IE...
I'd seriously consider using something else instead of the mammoth drop-down (which surely can't be very user friendly) - it sounds like a good candidate for a autocomplete search box, or perhaps multi-level cascading drop-downs.
You could also create the dialog when the page loads, and only open it when needed (set autoOpen: false in the options)