The HipHop compiler will optimize much, much more effectively if non-trivial eval() is disallowed, as it is in FB's production code. Obviously, since it's an ah

The HipHop compiler will optimize much, much more effectively if non-trivial eval() is disallowed, as it is in FB's production code. Obviously, since it's an ahead-of-time system, complex code in eval() will run slowly. The HipHop virtual machine is perfectly happy with eval().