I've posted something on this recently and I now realize it is a buffering issue. So... if I have choppy streaming video, and I can pause it so that it catches up.... is it a RAM issue or an internet speed issue?
If your choppy video issue is solved by buffering then it's an internet speed issue. You need to upgrade your internet speeds or get used to buffering. I had the same problem before I upgraded my internet speeds.
You don't buffer RAM. You either have enough or not enough.