The hub's problem is bandwidth. The client's problem is CPU time. Those "40
searches per second" are client CPU problems with regexes, not bandwidth
problems that would affect one's ability to share files (rendering your odd
ed2k comment utterly irrelevant).

I don't 100% agree. The problem of clients are both CPU time and bandwidth and probably more bandwidth than CPU, I explain. From the point of view of a single user, I agree with you but from the point of view of the network, it is better to have a client dropping some queries than having a client having a share speed (upstream) very low. In any case, if the network connection of a user "stalls", your queries/replies will be silently dropped thanks to UDP.

Eric