Switching from processors Intel i7 developed on the platform Sandy Bridge to those developed by the platform Ivy Bridge brought a performance increase of 7 - 13% for the Macs of the Apple Lossless Audio CODEC (ALAC),. Those who purchase the future Macs that will have Intel i7 processors developed using the platform would also benefit from the same thing. Haswell, at least this appears from one detailed test made by the people from tom's hardware on a prototype of the future processor.
In some cases, performance increases can reach up to 75%, but in most normal tasks the increases are modest, and things are even worse in the case of graphic performance. Integrated Intel HD 4600 cards do not allow users to play complex games on HD monitors, so MacBook Pros with Retina Display will probably work a little better, but not perfectly, as everyone expects from the American company's Macs.
