This might be an obvious post, but I thought I would still out it out there. I have a late 2011 Macbook pro. When I got the computer it ran sluggishly. I have logos portfolio with a few other smaller commentary sets and various resources.
I am currently running 16gb of ram (2x8gb) Corsair mac compatible ram and a 90GB SSD (Sata 3 - Ocz vertex). There is a huge difference when running a passage guide or doing a library search.
I previously had 8 gb (2x4gb) ram from gskill, and when I made the switch I could see a significant difference in speed of operation.
Hope this helps someone 
Blessings