Automatic graphics switching is a power saving feature that allows OS X to use the integrated graphics card whenever it determines that high-performance graphics capabilities are not being used.
Who wants that? I paid for the NVIDIA GeForce GT 750M, and I want it on all the time.
Use the checkbox labeled Automatic graphics switching at the top of the Energy Saver panel of System Preferences to disable this "feature" and get the Mac that you paid for back.
While this feature might save a little bit of energy, the subtle display glitches it introduces aren't worth it.