UpdateProgress Control - How to improve its responsiveness?

I'm using the UpdateProgress control in ASP.NET. My question is simply how do I improve it's responsiveness? It doesn't consistently show up if at all. I would use JQuery to simulate the effect but I'm trying to avoid introducing tons of j开发者_如何转开发avascript because it's a webforms application. Thanks for your help!

To resolve the inconsistency I set the "DisplayAfter" property to 1 millisecond. My guess is that the AJAX framework is using some heuristic for determining if the length of time of the request will be sufficiently long enough to display the update progress. Setting the "DisplayAfter" property must make it deterministic.