EXTRA SPEED: .....
Punch your keyboard and take SHA256 of the results. It's way much better than using an online third party RNG.
I actually tried this... it worked great! Thanks!
This is a decent RNG for small numbers, but not a lot of entropy for a whole key. It has only as much as the variety of punches, so it is not so great for high value long term storage if the generation method is known.