Hey all! For the past few months, I've been running Yosemite on my 13" Late 2013 Retina MacBook Pro. I reinstalled it today after getting fed up of constant system UI lag, and in third party applications. I'm talking about jerkiness when minimizing in both Scaled/Genie modes, choppiness when going into Launchpad, and scrolling lag. I'm a software developer, and I guess that puts me in a spot where I'm highly critical if things don't work as expected. UI lag on a £1.2k machine, in just system applications and lightweight third party ones? To me, that seems a little off. I've had the MacBook since February this year, and I'm unsure where to go with it. Unsure whether to sell it and get a 15" variant with a dedicated GPU. Does UI lag still occur on here? Perhaps I'm being a little immature, or expecting a little too much. I just don't like these little things eating away at me whilst I'm working. Any thoughts? All the best.