In ant man they kind of explain this. Smaller animals see the world in slow-motion. We tests this pretty simply using flicker rates.
Basically we flicker a light until the flickered light looks like it is always on. For humans the light needs to flicker 30 times per second for a fly it needs to flicker 300 per second. So for a fly we move in slow motion and if we were fly size to another animal they would appear to move slowly too.
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