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Philip Mateescu shares with us an in-depth and well documented speed test of Autofac v2.4.5.724, Castle.Windsor v2.5.3, Ninject v2.2.0.0, Spring.Net v1.3.1, StructureMap v2.6.1, and Microsoft Unity v2.1.0.0. Spoiler alert, Unity loses big time ;-)
Sprint.Net can also do some AOP stuff, and is more of an application framework, so I don't know if its results are skewed in this test because of that or not.
As for Autofac vs Ninject vs StructureMap, they all appear to be on equal footing feature-wise (from my cursory inspection). I think their speed differences have more to do with how they were designed rather than whether one is more feature-rich than the other.
I would also put myself out on a limb and say that providing more features isn't necessarily an excuse to perform slowly ;-)