I have tried Sophos, Avast!, ClamXav, and Bitdefender. Each when I run a scan they take my Ram from 12GB to Near 0. And the ram remains gone once the scan is complete until I either restart or use a memory cleaner app. The only one that didn't do this was Webroot ($30 yearly) trial I used. Strangely there is not much on the web about this. I would think more would be screaming to the heavens about such atrocities. Do you all see the same behavior when using any of the above antivirus scans? Is there a fix for this? The above apps developers seem oblivious to this problem. If they all do it makes me think it may be a Mavericks issue.