The result you get is very strange and also wrong. The objects are not moving so fast at all....
Also, in your render, it seems like corona rendered the first frame and over it there's another frame that is blurred much much too strong. At frame 7 the object can't be intersecting because of the dynamic body tag on the cloner....
And another thing - As far as I know, MB is an effect that is calculated during rendering, not during prepration...
On my machine (threadtripper 1950X), for frame 5, I get parsing time of 27 seconds (you got over 2 min), and I get 5 minuets 40 sec "geometry" preparation time....
Any developer here who can look into this ?? I don't think such a long preparation time is normal behavior