A lot of people ask questions about the speed of command processing. And now, in the only case the mirc helpfile advises to do something to speed up processing, no one seems to be interested ....

If you do /help /if you will find this:
"Using brackets speeds up processing. If an alias uses too few brackets then the statement might be ambiguous and the alias will take longer to parse, might be parsed incorrectly, or might not be parsed at all."