Asynchronous Rendering of Charts on Web Page

One of the requirements from our client was to dynamically load charts on the web page. The rendering of charts should also be asynchronous. We had a huge database each SP for fetching data took at an average 20 seconds. So if we had to synchronously load 10 charts on the page it would take 200 seconds for all the charts to load. This would not be acceptable by the business users.

Tools used: Visual Studio 2008, Dundas Chart and SQL server 2005.