Did you change it outside of FixedUpdate()? Which factor are we talking about, between 1 and 2?

Is your simulation running equally worse if you change Fixed Timestep in project settings?



I don't know what your game is about, but I would try to find a timestep which works smoothly and wouldn't change that.

Your idea might not waste any cycles on increased speed but you would certainly waste some on normal or reduced speed (given you need no extra accuracy at lower timeScale).

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