I'm having the same problem. High Sierra was just fine with SDJ & ME (3.1.1) until the most recent 2 updates. Now the waveforms are super jerky. Not pleasant to look at. I did try multiple things: I played around with multiple SDJ audio buffer settings, SDJ waveform frame rates, ME RAM settings, ME preview frame rates, ME output quality settings and more. The only thing that gets SDJ waveforms running smoothly again is closing ALL 3 of ME's preview windows, while ME still runs in the background. No, I do not have any ME windows on top of any SDJ moving GUI parts. I do have ME pinned on top though