If your SSD is your boot drive, perhaps a faster, larger SSD, such as a Samsung 850 Evo 500GB.
http://ssd.userbenchmark.com/Compare/Samsung-850-Evo-500GB-vs-Kingston-SSDNow-V300-120GB/3477vs1892
It's one of those things that the user should be noticing, such as low FPS, or slow boots or CPU at max often and so on. Try a UserBench benchmark. See how it performs. You might find that one of your components is operating lower than average (be sure to run a few tests, to ensure consistent good / bad performance).
You could try raising or lowering game settings known for CPU load or GPU load, or raise / lower display resolution. It might point to which (if any) are the cause of the FPS issues.