jfbus writes "PHP, like all scripting languages, suffers from having to parse all script files each time a page is displayed. Accelerators (opcode caches) are necessary to speed PHP enough for large websites. Here is a benchmark of the major PHP accelerators (Zend platform, apc and eAccelerator)."
"More software projects have gone awry for lack of calendar time than for all
other causes combined."
-- Fred Brooks, Jr., _The Mythical Man Month_