Top Ten Ways To Pump Up IIS Performance
If you host one or more Web sites that receive a lot of traffic, IIS performance is important to you. To enhance performance, you could always cluster your IIS servers or buy more bandwidth, but this tends to be a little expensive.
Fortunately, there are other things that you can do to boost IIS performance for free (or for a lot less than upgrading to a cluster would cost). In this Microsoft Technet article, Brien M. Posey share 10 techniques that by themselves may not dramatically improve performance, but combined can result in significant performance gains.