Hello - First post to MacRumors...we bought our 21.5" iMac about a year ago to get away from the slowness that we've experienced with Windows machines over the years. 2 months after we got the iMac things started to slow down...just like Windows!! I knew it was Safari all along because I look in the Activity Monitor and see it using over 1 Gig of memory all the time. Here is the version we're on: Version 5.0.2 (6533.18.5) I have brought the iMac into the Apple store so they could run diags on the machine...they replaced the airport card for no apparent reason, and I've spent countless hours on the phone with Apple sr. advisors trying to fix this issue. Apple had me run countless tests and even re-install the OS...of course the memory problem still exists and there is no apparent fix in site. I put my foot down and demanded they send me more memory, but they said it's against their policy to do so...we came to an agreement that they would send someone on site to my house to try to fix this issue. This Apple expert will be from one of their authorized service centers, not Apple directly. I checked the other post which said Flash ate up a ton of memory, we don't have flash running and Safari is still taking up 1 Gig of memory. The iMac at many times becomes unusable...and like most people we just use it for simple stuff - browsing, email, itunes, occasional iPhoto...any ideas, silver bullets??? I would love for this expensive machine to function again. Thanks