That's the problem. You think its "unrealistic" to have a near $3k purchase not stutter and lag during basic operations? Like I said, I'm sorry you had to lower your expectations to enjoy your machine.
Obviously apple has generally been conservative with hardware options but its never affected general user experience, which has always been a main goal of apple. In the case of the RMBP, apple stuffed it with very respectable hardware and yet it performs almost worse than my 2008 macbook in general UI responsiveness. You think stuttering and lag doesn't affect user experience? Really?
Imagine the next iPhone all of a sudden introduced laggy animation and stuttery FPS. Are you gonna come up with excuses for that too?
Lol, while I agree with you on that, it is a very expensive machine and because of that we all have the right to high expectations. I say your expectations are unrealistic because this is a first generation device, and because of that I think the product deserves a bit more forgiveness in regards to not being perfect. Apple has done quite a bit with the rMBP, and maybe they bit off more than they can chew with a 2880x1880 panel. I am not justifying the UI lag, it is something that needs to be fixed. However I don't believe the UI lag is enough to consider the machine, in adequate or not deserving of it's price tag (at least the base model...).
I agree that the UI affects the overall user experience, there is no denying that. However that is not what I said; I said that the UI lag, for my work, has not affected the usability or performance of my rMBP. Because this is all that matters to me, it has not affected MY experience. I think only an apple user would define the performance of their machine by UI FPS, I however have other needs which the rMBP fulfills perfectly. The UI lag is a sacrifice I'm willing to make, as there is no other machine on the market that satisfies my needs. I would never buy a cMBP, as I feel there are better options. This is not the case for the rMBP, if you are a gamer that needs maximum portability.
Understand I'm not saying this isn't a problem that needs to be addressed, I'm just saying it doesn't affect ME. You are clearly missing that point. This is my personal experience, and obviously others will disagree. However I do think it is unrealistic you expect such a high degree of perfection, when apple has already delivered in so many other ways, even at $3K you can't expect everything, Apple can only deliver so much. I don't care what you think, this is a software issue. The 650m is more than up to the job of rendering the UI smoothly at HiDPI resolutions, however apple is new at coding for the GPU, hence ML is not an overnight fix. I believe with time the UI lag will be mitigated. If your expecting next gen hardware to be leaps and bounds ahead of current gen hardware, you are ignorantly mistaken...
If you believe I am blindly trying to make excuses for my purchase or even for Apple (a company I utterly despise), you are sadly mistaken. The UI lag certainly exists, and I would like to see it gone, but because it does not affect the usability of the machine it is not something that truly matters to me. I don't need to create excuses for the rMBP, as it already satisfies everything I wanted from it, 3D performance, form factor, and battery life; something I could not have gotten from a PC, and this makes dealing with the UI lag WELL worth it too me. I think you should take a step back and realize others may have a different perspective than you, and value other aspects of a machine more than you. Are you ready to move on yet? I'm not sure why my subjective opinion is so important to you. I'm certainly the odd man out here, considering my view on computer hardware in general. You imply my logic is flawed, however it is your perspective that is skewed...