there's that whole bug where someone connecting to your server may wind up with the downloads freezing while they download your server's files.
What's interesting about this, is that when my sister (or when someone else) joins, I lag like crazy, almost to the point of crashing. (As you stated above).
But what's really interesting, is that this (normally) only happens when the first two people join, after that it's smooth sailing.
And as you stated in the rest of your quote, (I cut it out because I didn't think I was going to need it). You crash once they leave if it's frozen, but that's the thing. They don't leave. (Well my sister doesn't anyway).
Now, I haven't hosted in a long time, and nor is my computer the best for gaming/hosting. But I'm not terribly sure if this bug can still happen once the 6th person joins. (A little light on the question would be appreciated, and without any needles insults, as this is probably a dumb question).