Routing vs Url Rewrite (IIS7) Performance

Question

I was wondering is there any difference in terms of performance between the two approaches? Any good articles on this?

Answer 1

Lets think about the difference in what's actually happening:

URL rewriting:

• IIS receives request and passes it to unmanaged module
• Module matches the request against a set of patterns and returns a transformation
• IIS passes the returned transformation to the ASP.NET module and starts request lifecycle

Routing:

• IIS receives request and passes it to ASP.NET
• ASP.NET matches the request against a set of patterns and determines an entry point for handling the request
• ASP.NET begins request lifecycle on that handler

I'd say the two are so close you'd be hard-pressed to find a situation where the difference is noticeable.