Sorry I have to repeat this, but it's a tolerance level issue. UI lag is a frame rate discussion. Some people can deal with less than 30fps animation, others can't. So it's pointless to accuse people of denying there is lag, because those people don't see it as an issue.
On the other hand other people need 60fps everything or they won't be happy. You are seemingly in this group. Yes, flipping through the calendar app is not buttery smooth, and yes it does suck. Unfortunately for you it doesn't suck enough for people not to buy one and for it to be one of Apple's most popular products. So the best you can do is deal and let Apple continue to work on the UI experience. If 10.8.3 is any indication then you will see improvements of the software front, and the hardware will obviously get better and more capable.
If you can't wait, if you "hate" your retina MacBook then I don't see the point in torturing yourself with this issue. Just return it or sell it and then get a classic like peejack did.
It has nothing to do with tolerance level and 30 FPS or 60 FPS. Complete non-sense. If it takes half a second to go into mission control, than this has nothing to do with low FPS. Furthermore, when connecting the very same mac to an external display, it runs smoothly as every Mac I ever used. There is a clear problem with the drivers and the retina display. I am quite confident that they will fix the problem with the new OS. I will not accept that my 2009 Macbook running Mountain Lion, has no GUI lag whatsoever while my maxed out 2012 machine struggles. Full stop.