download and upload speed are more just rates than a measure of how fast it gets there… analogous to how wide a race track is, and therefore how many cars can race along side-by-side. ping time is how fast it actually gets there, analogous to how fast racers travel on said track. I don’t think upload speed would be a problem, to be honest, once you get to 1mb/s.
it may be more of just the time that all the different connections take to talk to each other… best diagnostic for that is like MP said, (if you’re in windows) open the command prompt (most universal method: <win> + <r>, then in the run dialog box type in cmd) and then when you get the console type in tracert gaming.wcu.edu… post those results (at least the times, the ip addresses are fairly irrelevant – just mark where your modem and router are on the list, if you know how to distinguish between them) and peeps can prolly draw better conclusions about what’s tying you up.