All this time, I was under the impression that it was possible to run the rMBP in "legacy" mode via pixel doubling (4 pixels now equals 1 pixel) so that it is essentially running in 1440x900. This would, theoretically, eliminate any lag issues the rMBP faces that the legacy models do not, and the two computers would become basically identical save for form factor. With this impression, I felt I could run in 1440x900 while playing games to get peak performance while not sacrificing quality since this is what I'm used to on the old models. I think it is still possible in games but I hear it performs much worse than a native 1440x900 display. Why is this so when it is just integer scaling? My main question is, is 1440x900 really not possible? Thanks.