Hasta La Motion!

I setup a simple rubik’s cube in a maya scene, made it a active rigid body, gave some gravity and turbulence. Play animation and it simulates fine and fast

Now, I match move a scene and import the FBX into Maya. Then I import my rubik cube animation into this scene and the animation is fine and plays fast.

But the imported scene (rubik’s cube) is too large for the FBX imported scene, so I try to scale and match the camera. The moment I scale, the simulation of the Rubik’s cube becomes very very slow, 1 minute per frame on the viewport??

Is there any reasoning behind this? Is this the right work flow?