I generally use alacritty but used rxvt back when. That's a name I've not heard in awhile!

I tried `cat /dev/random` in alacritty, rxvt, and xterm to compare output speed. rxvt and xterm both start 'instantly' on my laptop. With alacritty it's slower. Scroll speed of both rxvt and xterm are very similar though xterm seems to win by a little. Both blow the doors off alacritty though.

I'm not sure if this is a fair test, and hence why I posted, but if it is this is a very easy way to get a feel for the difference.