Prime Video is streaming at 50 FPS. Our eyes/brain is used to watching TV channels in India at 25 FPS. That's the reason 50 FPS "feels" fast. But in fact this reduces the strain on our eyes and brain as it is not required to interpolate the missing frames. If a person is used to 50/60 FPS broadcast, this interpolation due to 25 FPS in fact makes the video feel jittery.