I'm currently on an older 2011 Macbook Pro 15" 2.0 Core i7 15" matte display 8GB Ram 128GB SSD and 720gb HD Radeon 6750 512mb Will I see a significant increase in performance going to a early or late refurbed 2013 model? I mainly use Adobe Lightroom to export my RAW photos. That's the most taxing work I do. I will most likely pair it up with an external monitor. Early 2013 2.4 i7 15" retina 8GB ram 256GB SSD 1GB Gefore 650 Late 2013 2.0 i7 15" retina 8GB ram 256GB SSD Intel Iris Pro Another thought was to go to an iMac if I can live without the portability though the ones with an SSD are quite a bit more. Thought about running the OS on an external USB 3 or thunderbolt drive instead.