I've got a mid-09 15" MBP, and it's running 10.9.2. I might be pushing it with this release, but it's a little late to go back now. What happens is whenever I wake it from sleep or have a few tabs open or try to send an email or even edit text in a text field (here on MR for example), I get a beach ball and a lag that can last up to a minute. I check my Activity Monitor, and it's usually up at 4 GB of ram (what I have installed), so my assumption is that I'm maxing out the ram. My fear, though, is that if I upgrade that and put in 8 GB, then the "safari web content" and "kernel task" will just balloon up to 8 GB anyway, using up everything I've got. The SSD upgrade from OWC with a data doubler is also an option for me to squeeze a few more years out of this machine, but I just can't do them at the same time. Any thoughts on this one? Which is going to give me the better results more quickly? SSD upgrade or RAM upgrade? Thanks!