Java Server Pages > PHP

Why the do people use PHP when JSP exists? It kills PHP in just about every metric: runtime performance, separation of code, portability, and throughput.
[ http://www.research.ibm.com/trl/people/mich/pub/200812_middleware2008specweb.pdf ]

The other alternative is ASP.NET if you're stuck on Microsoft shite. I still don't understand why SLOW AS FUCK PHP is still so widely used.

Hi I'm new to JVM. I want to create a toy language on top of it, like Scala or Clojure. Any pointers on where I should begin? Thanks. PS: What is a servlet? Is that the JAVA lingo for server process?