One of the new features added in Silverlight 4 RC that shipped at MIX 2010 is a new mode of the HTTP polling duplex protocol which greatly improves the performance of data push scenarios compared to the previously available versions of HTTP polling duplex. I have compared the performance of various data push options in Silverlight 4 RC (including net.tcp and the various modes of HTTP polling duplex protocol) on my blog. Let us know what you think!

Tomasz Janczuk