Hey... i have the same problem,running a MBP 15" mid 2012 with 16Gb ram and a 500gb solid state drive hard drive, but what mine does is.. waves get VERY choppy when i click the little square located on the right bottom corner which expands the external display, however if i manually stretch the external display to fit the whole external monitor,waves are nice and smooth :/ i know,very weird, i'll try those optimizations and will keep you posted...