ASP/PHP vs HTML files

[Gene Grimm]

This is a novice type question, being that I haven't done much research on this
question. As I understand it, ASP and PHP pages must be read by the server 
software
and processed as it is sent to the browser client, while HTML is simply 
transferred
as-is. Does the extra processing of ASP and PHP pages have any significant 
effect on
the CPU usage of a web server?