I suspect much of the speed difference is due to choosing a slower dispatch method. All objects except threads so far are value types, including coroutines, an

I suspect much of the speed difference is due to choosing a slower dispatch method. All objects except threads so far are value types, including coroutines, and I plan to push that angle further since I'm a huge fan. But nothing is stopping you from adding a custom type that stores shared_ptr:s or whatever.