Agreed it is tough to answer. Highly polymorphic code is often not that diverse, for one. And many languages that encourage polymorphism are run with a jit.

Agreed it is tough to answer. Highly polymorphic code is often not that diverse, for one. And many languages that encourage polymorphism are run with a jit. Which can be seen as a higher level branch predictor. And, predictably, benefits code paths that don't have a lot of diversity in the types being sent through code.