I am a new Mac owner, so forgive my Windows orientation (!!!) but is it possible/desirable to tweak OSX to improve broadband performance and, if so, how does one do that? I am running my new iMac via the wireless connection, but even assuming that would slow things down a bit, my speed has dropped from 9000+ to barely 2000. On my former computer (Dell) I used a program to modify the RWIN and tweak my connection, but didn't know what is normal/recommended now. Thanks.