Why do my objects seem to float after collision?

This seems to be a “simple” problem and perhaps an “obvious” answer. Howerver I can’t seem to find it in any posts so I must be using the wrong vocabulary. I have two small spheres in translucent box. They’re free to bump around as the box is manipulated by rotating and shaking. When they collide into the wall, they seem to float through the air, slow motion. I’ve tried changing the mass, the gravity, the timescale… I can’t seem to get it true to the real world. In the real world these sphere would be 3-5cm diameter and the box about 10cm
1.5 scale, .5 mass,
-9.87 gravity
Max Allowed Timestep .36
Fixed timestamp .01
Timescale 1

it runs with high fps?