I think in reality, you're going to need a VPS or a dedicated server as not many hosts will allow you to run something as resource intensive as that on a shared host. If a shared host finds you hogging their CPU cycles like that they'll typically shut you down.
For what its worth, you could always install a WAMP system on a normal PC at your home / office and let run the code.
My helpful sig has gone because a mod below the administrator gave me an infraction - despite the administrator personally agreeing to it.
If you need any php tips or tricks you can PM me.