In most cases, I'd expect almost identical performance to the 13" 2011 since it has the same processor and the CPU's are so closely matched. I owned one thought it performed decently as long as you lowered the settings to the minimums and used a low screen resolution. I stepped up to the MBP 15" though for the discrete video card which is a much better performer at the 1920x1080 resolution I run on my main screen.