Faster Keystroke Echo05 Aug 2014, by Artur Malabarba.
My laptop is so old it is almost getting out-performed by my smartphone, the principal consequence being that its keyboard has started to give up on life. Occasionally, a key won't register when I hit it, and occasionally I'll get paranoid and hit a key twice without knowing it actually had registered the first time.
Emacs' keystroke echoing is a fantastic aid in this regard, informing me whether the key worked or not when I'm typing a complex sequenced command. I only need to make it faster so that I don't have to wait for it.