I wondered: would the new HiDPI (Retina display) support cause a change in performance? My concern was that things could become slower with Photoshop pushing around more pixels.
It turns out that sometimes you get a freebie:
I don’t know if performance is better on other machines, or just with the MBP Retina. Presumably nothing changes on other machines, but it’s possible that some other general improvement has been made.
See also Optimizing Photoshop CS6.
Results below using the diglloydSpeed1 benchmark.
Disabling OpenGL (graphics acceleration) is provably slightly faster for common tasks than leaving it enabled.
This is nothing new.