Hi, I'm not sure if this was asked before sad

When I watched 1080p vid using SVP Pro, everything is fine and 60 fps good most of the time. EXCEPT when there is a fast motion/action, it turns choppy. The framerate doesn't seem to drop (checked from MPC), but it looks kinda like a slideshow. After the motion stops, the video becomes smooth again.

My spec is Core i7-6500U 2.5-3.1 ghz, GTX 950m, which I think is acceptable enough. The vid was rendered with the onboard Intel HD 520 (QuickSync), while GPU acceleration in SVP was with GTX 950m. I tried playing around with MPC Hardware Decoder (changing to CUVID, DXA2...), but it doesn't improve the situation.

Which setting in SVP Pro should I try? Or should I modify something in MPC/ffdshow?????