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Message: <blockquote data-quote="chas_m" data-source="post: 1637838">You can't downgrade the OS*, and since Yosemite isn't actually the problem (I'm writing this on a lightning-fast mid-2012 MacBook Pro 13-inch), downgrading wouldn't actually fix whatever the real issue is anyway.Upgrading to an SSD is pretty easy, however. You simply need to make a backup of your drive to an external  hard drive using Time Machine or your preferred clone program (I like Carbon Copy Cloner or Chronosync), or (if you like to live on the edge), just remove the old hard drive, put it into an external USB 3 enclosure (your machine has USB3 and it will make a HUGE difference), install the SSD and then boot from the external "old" drive and clone it over. I say "live on the edge" because without a backup there is a risk that you can't get that to work and then you'll be up a certain stinky brown tributary without proper means of locomotion.*Unless you happen to have previously made a bootable copy of the Mountain Lion installer on a USB drive, I suppose, but even then you'll have to wipe the drive to make that work, and I generally don't recommend it.</blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?