sometimes I have random curiosities while I'm out and unable to test things. this is one of them (will comment with answer if I ever test it):

obviously writing aliases to make things you do frequently easy is a win. but what about typo aliases? stuff like sl, dc, she, etc. these aren't typo'ed often (hopefully) but are defined every single time you create a new terminal.

has this probably miniscule overhead actually been meaningfully measured?

question: how many aliases must be defined to cause a significant (say, 3sec?) slowdown when opening a new terminal?