That's really a minor issue as a person can only flood you so much without the server kicking them off, so the slow down wouldn't even be noticeable.
Absolutely, however, from reading Myndzi's tutorial (Dalnet #scripting op) there is an issue with 'screen lag' when the user floods with excessive ctrl codes.
Straight from the tutorial, take a look at.
//var %t = $ticks + 4000 | while (%t > $ticks) { echo -a $str($+($chr(2),$chr(35)),400) | dec %i }
And you'll see what I mean.
Meh.