Shattered Kingdoms

You probably won't notice it unless you get into PK, or a situation where a lot of text is given to your mud client.

What I noticed is that it would just freeze up for a while and by the time it was unfrozen the fight would be over. It'll also give you this great cascading effect as all of the text scrolls onto your screen all at once.

That only happens to me when I accidentally hit the pause button.