Not sure what the current situation is, but PHP used to ship with APC, a shared memory cache, that enables this exactly. Even without filesystem overhead!
I still miss PHP's simple deployment, execution and parallelization model, in these over-engineered asyncy JavaScripty days.
My point wasn't using them with CGI, rather that they have JIT in the box, nodejs with V8, PHP has zend and its own JIT since Facebook efforts with HipHop and later Hack (HHVM), both with server support as well, no need for CGI approach.
