Asynchronous Controller is blocking requests in ASP.NET MVC through jQuery

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There are two issues in play here. The first is that your controller is not truly asynchronous. Spinning up a ThreadPool thread to perform work generally has worse performance characteristics than just doing everything from within the action method itself, as you’re still taking ThreadPool resources from ASP.NET (which just shares the CLR ThreadPool), and you’re now forcing the CLR and the OS to juggle threads. See http://msdn.microsoft.com/en-us/library/ee728598.aspx#choosing_synchronous_or_asynchronous_action_methods for more information. Basically, what that link boils down to is that if you can’t use I/O completion ports for your asynchronous operations, you’re very unlikely to see improved performance.

The second issue is that ASP.NET MVC takes a Session lock on all requests. Multiple requests within a single Session will always be serialized, as otherwise the user’s Session could become corrupted if one controller writes to Session as another controller is trying to read it. See http://forums.asp.net/t/1501623.aspx for context and a workaround. MVC 2 Futures has a way of disabling this lock; it may also be included in MVC 3 proper. See Link for more information on this.

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