As a video editor and VFX expert of 50 years, I studied this video frame by frame and I stake my professional career on this... this video is unedited and she appears to really move that fast. Based on the amount of frames in the transition from Pose A to Pose B, cross referencing with the bpm of the song as well as the frame rate of the video, and feeding the data to a special algorithm, she moved close, but not quite, to the speed of sound.