That’s extremely good stuff, but hopefully it’s obvious from my previous comment that keypress latency isn’t really what I was talking about testing. With some good software and a modern USB 3 keyboard you can engineer a program that on a windows 11 pc puts a character on the screen at some respectable time multiple (sigh) of an Apple II, but how much unavoidable UI and other OS slowness would a user have to navigate through just to start up such a program? (and do we really think hardware performance is the limiting factor there, or poor software engineering and design?)