I'm a bit surprised by the performance advantage Litespeed/FCGI/PHP has over Apache/mod_php as shown in your benchmark. After all, in Apache/mod_php the PHP engine is in-process, while in Litespeed/FCGI/PHP, there's inter-process communication costs between Apache & FCGI. I'd think Apache/mod_php will always be faster for that reason. Do you know what's behind the performance advantage? Also do you have data for higher concurrency, maybe up to 100 concurrent clients? A comparison with Zeus/FCGI would be nice too. Now that I think about it more, one way for Litespeed/FCGI/PHP to beat Apache/mod_php would be if you implement your FCGI as a single process multiplexing multiple concurrent FCGI requests from Litespeed, kinda like how Litespeed multiplex concurrent http requests. I don't think this is the case from reading the doc, but it'd be very cool. Do you have any plan to do this? About SSL performance - why is Litespeed so much better than Apache in the benchmark?