[blueflow]

There is a thing that cool-retro-term is lacking: Letters showing up on the screen the instant you press the keyboard button.

[youngNed]

As a user of a dec vt220 on a college vax vms, I can assure you, that did not happen on all old hardware.

[burnte]

Depends on your definition of instant. The lag has seemed normal in CRT for me, and I've been using it for years.