Having a slow computer is a definite pain for anyone who claims to be a lover of gadgets and so a solution to that would be to upgrade to a faster and more efficient source of muscle, the G.Skill 16GB(2x8G)PC-12800(1600Mhz) SODIMM DDR3 for Mac.
For a DDR3 RAM that has up to 16 Gigabytes of memory capacity, is made by a company that has long held a reputation for producing some of the highest quality products in the same lineup, is compatible for MAC notebooks, and is durable enough to withstand pretty much all expected stresses, then you really have no need to look further.