How fast you post and the results seem subjective depending on machine/server sb is running on.
The type of proxies used seem to play a larger role in the return of how many links you get out of a list.
My results came from,
135 or 145 fast poster connections and 45 second time out.
So I do not think the list is slow.
10 people could get a list and as long as the amount of found links are about the same I suppose thats all that matters.