No ICQ
A user just reported having their net quake problems go
away when they killed ICQ. I suppose it has never been stated
directly, so here goes:
Quake needs all the bandwidth that a modem connection provides
to play well. Any other program accessing the internet is
going to cause a degredation in gameplay, sometimes severe.
So quit IRC, ICQ, email, and web browsers before setting out
for serious net play unless you have ISDN or better.