Hey all: I've got a late 2011 13" MBP with Yosemite. It has been getting incredibly slow. Apps open slow, keyboard delays as I'm typing, etc. I downloaded memory cleaner and watching the available ram, it is constantly somewhere between 0%-7%. I've also been watching the "memory pressure" in activity monitor but it is almost always green, have only seen it jump into yellow once. So that being said, I'd like to get it up to speed again, but not sure memory is the issue. Although at any given time its usually around 0%-4% available, memory pressure never really spikes. Any thoughts on whether I'd be better off upgrading to 8gb ram (from 4gb) or instead upgrading to a SSD? Or something else? Thank you!