Hi I use my MacBookPro5,2 everyday for internet and email and sometimes for audio and video work - basic stuff nothing fancy. I was using 10.6.8 for years and then upgraded for free to Yosemite and am now running 10.10.5 (14F1605 I find the machine really slow and am seriously thinking of erasing the disk and installing 10.8.5 My question to you all is what have you found is the optimal operating system to run on this computer? I have maxed out the ram to 8 gig and I have a Samsung SSD running the OS. I might install a data doubler with another SSD and am looking for an expresscard 34 USB 3 solution too. What annoys me is that Apple keeps telling me to upgrade the OS in little pop up windows while the machine is so slow sometimes that I actually thought the trackpad was dying. (I know the mousepad/trackpad isnt dying because in these moments of waiting for the machine to respond even the arrow keys on the keyboard wouldnt repond!). I just feel that the OS is too much for the processor and ram. Im sure there must be an optimal OS to be running for each machine if the hardware options are as has fast as they can be? I dont have a lot of cash to spend on a new machine and I like the matt screen which is 17 inches on this laptop! I feel its a bit unethical on Apple's part to be so pushy about upgrading my OS when it should know damn well that Im not going to have a good experience on the machine if I upgrade to the latest OS!!! I dont see a way to turn these notifications to update the OS off. The only 2 options are "Install now" or "Remind me later" The "Turn these notifications off forever" option just isnt there!! Is this Apple's way of forcing people into buying new hardware and dumping their current machine?