Well...it all depends. If you are hosting a game, and a dial-up guy wants to join...it may be quite bad. If you join a game where all other members are DSL/Cable, and you are the only dial-up...you will probably not ahve trouble unless you ISP is in a bad area (how many residents in your area have dial-up, working on the same line, like your neighbors).
Once, I was hosting a game and I have cable. When one person that was dial-up joined, there was no problem. When a second dial-up joined...things stared messing up for the second person. I do not know the specifics of that problem, but well...there you go.
Anyway...bottom line is...congratulations on having a cool Mplayer game! I wish you many more!
ANd...get Cable ASAFP.
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