Exactly John,

A huge memory savings. And PHP does no multi-threading whatsoever yet it is #1. It doesn't even have an ISAPI module. Why is PHP popular: cuz it's easyyyy and it doesn't have all that MS baggage and bloat..

A lot of these folks here are parroting things they've heard from the .NET cheerleaders for years..

>The boast of mtdll is that only one instance of the runtimes is instantiated and used by all subsequent threads.