[_ck_]

eaccellerator and xcache are derived from the same original core – eaccellerator is a tad slower than both xcache and apc, but it also has the fewest problems and fewest incompatibilities compared to both. I believe it also has several people working on it, unlike xcache which means the project doesn’t grind to a halt when one person becomes distracted. No opcode cache project can in theory leapfrog in performance over another, it’s just little tweaks here and there.

The big secret is replacing Apache with LiteSpeed or if you really have alot of time on your hands and don’t need virtual hosts, Lighttpd. Apache is very inefficient, especially running PHP.