In turn, this should impact performance negatively in a significant way: the 15″ Retina Macbook Pro was a beast when it comes to graphics performance (see our complete Retina Macbook Pro 15″ review), especially for a 4.5lbs computer. With integrated graphics, the 13″ version would simply be as slow as legions of Ultrabooks out there, and frankly, this is surprising for a “pro” laptop from Apple. It may be even be slower than the original Macbook Air.
As it stands, the integrated GPU would just be fast enough to drive the rumored 2560×1600 native resolution of the LCD, so you can basically forget about gaming, high-performance GPU compute and I wonder what the performance in Photoshop real-time previews is going to look like. We’ll have to review it ourselves, but this does not sound good. What do you think? Do you want a discrete GPU in the Retina Macbook Pro 13?