KBD Rhythm

Tekken KBD practice as a basic rhythm game

Note that the tempo even for hard mode is not "optimal" when it comes to actual Tekken gameplay. That is because there is no real optimal tempo. How often you should perform the cancel depend on a number of factors: your character, your risk tolerance, your cancel speed, and how much space you actually need to create.

This trainer isolates speed to just the cancel inputs since that's the thing you actually want to get faster. Outside of that, what you want is control (being able to stick to an arbitrary tempo). Then in-game you can vary your tempo as the aforementioned factors change.