[kalleboo]

My main computer is the original 2012 rMBP, and it's way faster on El Cap than the original OS it came with. Throughout the first couple versions, I was hankering for a new laptop due to the graphics chipset not keeping up with the HiDPI display. But somewhere along the way Apple really nailed the graphics performance to the point I never even think about it.

There was just one dud of an OS in there (Mavericks? I think) where the machine would just bog down over the week and I had to reboot it every 2 weeks just to regain performance. That was improved with the next release, and now on El Cap I only ever reboot for security updates (two months or so of uptime)

OS X does tend to get more RAM-hungry with each version though, so I recommend everyone to max out the RAM when they can.