The thing is that mIRC can't immediately know when someone is away because the server doesn't notify any other users unless they try to message that person or perform some kind of /who or /whois on them.

If XChat has this feature then I can only assume it sends out a /who for every user on every channel you're in at regular intervals which is a very bandwidth consuming thing to do.


Spelling mistakes, grammatical errors, and stupid comments are intentional.