I started a thread on the Mono mailing list a couple months ago about web hosting performance on Mono ( http://mono.1490590.n4.nabble.com/FastCGI-Performance-td4662... ). It turns out the default implementation for FastCGI is really slow. Some members of the community have created a few different implementations. The fastest one currently is a thin wrapper over evhttp which can handle over 100k requests per second on a simple benchmark. There are other discussions as well about how to improve performance.
