Supporting call/cc and dynamic-wind has a significant performance impact in some languages, even for code that does not use the features. Supporting coroutine.

Supporting call/cc and dynamic-wind has a significant performance impact in some languages, even for code that does not use the features. Supporting coroutine.create+coroutine.clone, shift+reset, or setcontext+getcontext+makecontext+swapcontext seems to have no performance impact on code that does not use the features.