I just brought my retina MacBook Pro 2.7/16gb/768ssd in to an apple genius to go over the lag issues and the IR. I showed him the stuttering on iGPU and the smoothness on dGPU and he said it seems like the iGPU is having issues handling the display. He was then going to connect it to their network via ethernet to run some hardware tests and he couldn't get it connected via USB or Ethernet/thunderbolt. He also saw the screen distorted towards the bottom.
He couldn't perform any test and said since I paid over $4000 for a maxed out spec rmbp he would exchange or return. I told him I was within the 14 days and I would return it. He agreed and also agreed when I said I think it's best to wait for the next refresh model since this is the first production run of these models.

He couldn't perform any test and said since I paid over $4000 for a maxed out spec rmbp he would exchange or return. I told him I was within the 14 days and I would return it. He agreed and also agreed when I said I think it's best to wait for the next refresh model since this is the first production run of these models.