I vastly prefer cml, but hopac has a lot of missed opportunities. I vibe coded my own language on top of c# that has a cml that is much more integrated with the language (and no other constructs are available :)). Being able to use events for things like reading from ports, so that you can select over reads and only the winning read actually takes anything from the port is more than nice to have. Or having STM that can be run as an event, so that you can choose over a transaction or a timeout in extreme congestion. Since it is composable, you can abstract away a lot of the details behind simple function calls.

I am kind of curious if it becomes faster when moving to dotnet11.