Guys! Safari was giving me fits with poor performance until I tried this free download: http://bafford.com/software/unlockupd/ John Bafford states: "Unlockupd works around a bug in lookupd, a system service which is required for proper operation of Mac OS X. If lookupd fails, the system quickly becomes unusable. Unlockupd periodically checks lookupds status and forces it to restart should it fail. Unlockupd has undergone a significant amount of testing since July 2004, with no reported problems. Mac OS X 10.5 (Leopard) appears to have fixed the problem by eliminating lookupd altogether. Installing Unlockupd on Leopard should cause no problems, but it is not recommended, as it is not necessary." If Safari is giving you fits on an earlier iMac, give it a try, it helped me a lot.