I have a Mid 2012 13-inch MacBook Pro. To speed it up, I bought two Kingston PC3L-12800 1600 MHz memory modules which have 4 GB each. However, my computer keeps showing the famous "beach ball" if try to do to many things at the same time (keeping multiple tabs open, closing applications one after another etc).
Do you think there is a compatibility issue? If so, is there a way that I can solve it?