I can't honestly say I've not experienced 'terrible performance' in any of my photographic or video post production and grading workflow...Premier, After Effects/In Design, Photoshop and Aperture...FCPx and Audition....Cinema 4D and Maya, my list goes on...and other than a couple of my choices haven't been updated for the HiDPI resolutions, they all work VERY well and extremely Fast!
We've got two rMBPs. Neither has these issues...but...we don't use Bootcamp, and we don't game! The rMBP isn't set up as a gaming laptop. I see you're relatively new here. Apple isn't nor hasn't been known to provide top shelf gaming experience in their products. There are plenty of options on the market, some configurations just as expensive as the rMBP from Alienware, Falcon, IBuyPower, etc, etc...While the price of the rMBP reflects a 'luxury/high end' example it computing---it absolutely IS! A professional machine (Check out Dell's Precision line) isn't optimized for gaming FPS. Many times, the graphics card choices reflect this. See the nVidia Quadro cards for example, working with 3D rendering and CAD/Scientific research a modeling in engineering.
Possibly you're looking in the wrong area for a gaming portable? While it's a compelling computer---and may in the future make sense for gaming, as it is, I think you may be expecting something different than Apple had in mind.
Just my $.02
J