Hi everyone, I and many others are very curious about the performance when forcing the rMBP to use the HD4000 with gfxCardStatus. And very interesting would be how the mac performs when using the HD4000 and upscaled resolutions, as they should theoretically be more taxing. Has anyone got experiences in this? Some claim it's no problem, some that it's sluggish. I just don't know what to believe and it's of course very relevant for many, with the 13" rMBP on the horizon. Thanks a lot, it'll be an enormous help. .