So I have a late 2011 13" Macbook Pro(Intel HD 3000, Intel i5) which I have upgraded adding a SSD and 8GB Ram and I recently connected a Dell U2713H display to it (resolution of 2560x1440). The thing is I use Photoshop a lot and I've noticed that working on the external display has slowed down the graphics (the transitions, dragging images, etc. don't look smooth) and also made the whole system a little bit slower. I knew this was going to happen in a certain level but I wanted to know if you guys can give advice of if there's something I could do to make Photoshop work more smoothly. I was thinking of adding 4gb more of RAM to my computer, would that work? Thanks!