I have an Macbook Retina 13" with an Intel 4000 graphic card. I already post before about the performance but I need to do a new review based on the latest patch + correct settings. It works now really ok. Not perfect but it is acceptable.
If you want to use it on the macbook Retina 13" make sure that you set the render settings low and deactivate the Realtime Thumbnails. Than it is working with around 40% of CPU usage.
All in all great that it works now. Im really happy