Anybody know about LiteSpeed Web Server?

[RichardGv]

Huh, Zack, actually they claimed it's cPanel-compatible directly on the homepage...
But I hate closed-source software... Partially because I cannot use special optimization flags during compilation. :D It's surprising (or depressing) that they don't even provide a free x64 build for Linux. On a x64 processor (well, almost all recent processors are) the performance of a x86 system could be lower than a x86_64 system for 10%-20%.
And after all, commercial software tends to have very exaggerated description. I remember there are so many commercial download managers that claim able to accelerate download by 600%, which is esentially impossible. :)
Also, nginx seems faster and less resource-intensive, according to what I heard. It does not read Apache configuration, though. lighttpd seems a pretty popular alternative, too.