The TTL is different. It used to be 6 or 7, now it's 3 or 4 and the queries are dynamically sent to use lower bandwidth.

An average of 4MB in/out is a pretty astounding achievement for an Ultrapeer. It used to be 8MB+ AND lots of information was flow controlled (meaning dropped because we were reaching the upload threshold and/or other hosts couldn't accept information that quickly). Now almost nothing is flow controlled and we're using less than half the bandwidth we used to, AND we're connected to more than triple the amount of hosts.