JSP PHP pros n cons

the website friendster.com switched from jsp/tomcat to php, and it is noticibly faster. what are the reasons someone would use jsp over php?sorry for generalized questions, i'm new to learning the technologies.
[232 byte] By [mikeni1225a] at [2007-11-26 15:06:02]
# 1
they have their own reason.. it is business as you think.. and not the pros or cons of jsp vs php they were after..
jgalacambraa at 2007-7-8 8:55:53 > top of Java-index,Enterprise & Remote Computing,Web Tier APIs...