Long time UNIX (AIX, HPUX) guy at work, Mac OSX guy at home for the last 4 years. When Apple started the OSX bloat with Lion/Mountain Lion, my 4 year old iMac was no longer usable because of all the paging it was doing. Between OSX and Safari, nearly 3/4 of my 4GB RAM was used with just a dozen tabs open. Since I was at max RAM, I could only resolve the issue in the Apple world by buying another iMac for $2500. Dumping OSX and moving to FreeBSD has extended the life of my iMac and significantly improved my computing experience. Should have done this 4 years ago.