my server ran for a good 4 months and i never really had any lag problems with it (seeing as how all the people who played on it were a few streets away from me) but i ran it with a cable connection.
good to see that you are trying to fix the problem spark, i've taken alot of crap from kids i play with bcuz i lost to some kid who CLEARLY wasn't lagging, and i could barely move on your server. Although everyone SAID he was lagging just as bad as me, i noticed somehow that he could strafe run right into my base, run past me, go back for the flag, and kill me before i could get to the nearest gun... whatever. i beat him on the official tryout...