Numerous benchmarks have continued to show FreeBSD’s clear advantage for network performance. Yahoo!, Xoom.com, Qwest, and some of our other largest customers have published results showing the clear case for using FreeBSD in the enterprise. It’s important to understand that benchmarking is just a game, and that for real performance comparisons you need to perform real-world test. However, it’s easy to find published benchmarks on the Internet which show FreeBSD with a commanding lead over the competition.

http://www.thewhir.com/marketwatch/hos042505.cfm