For LimeWire I don't know.

gtk-gnutella limits
* duplicate packets to 5 or 1.5% (the higher one)
* flow controlled time (max. 70% of the time, max 180s) - I'm not sure what that means, but I assume it's the time when packets get dropped.

I don't think that our implementation is inefficient, and the code is very nice to read, but I think that the proposed one will be better for the network and the user, since the client will automatically move towards clients with similar bandwidth capacity and query behaviour.

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