Someone else may have some suggestions. I am not big on using bt's. But at least not being a UP will prevent many connections from gnutella users using you to help to connect to the network. You'll be connecting with 3-5 UP's. Not connecting with 15-30 peers as would be the case if you were an UP.

It may also be worth closing off old search boxes periodically. They tend to go a little stale after a while anyway as people come & go from the network.