General Speed and Server Caching

I am advocating a move to PHP for our corporate website as well as our intranet. My boss, has raised an issue to which I've found no useful response. His question was, can PHP scripts be cached in the server similar to the way JSPs or ISAPI dlls are handled. For instance, I have a library of functions I have already written. His argument is that the library must be re-interpretted each time the script is hit. Is there any way to avoid that? Any help is appreciated! Joshua Groboski Programmer Analyst / WebMaster SAVVIS Communications http://www.savvis.net