High idle is not the question, but throttle response (spool-up/down) is.
Example: A two stroke bike does not have the engine braking action that a 4-stroke shows, nor does the trottle response match the 4-stroke engine.
The lack of braking is due to extremely low pumping losses in the two stroke once the throttle is closed at high speed.
During the process, extra fuel mist accumulates at the crankcase walls and case pockets. This extra fuel must be cleared out again when the throttle is applied, so there is a lag where the mixture strength is undefined, resulting in less than optimum power, and reduced spool-up speed.