Why "Rotation" and "MoveAhead"action take significantly more time than other actions?

I tried to make the steps within an episode faster. Since my agent spends more time per step in the environment, I would like to investigate if some actions are causing this problem.

So I have printed the time consumption of each action, and I found out that the time consumption of "RotateLeft", "RotateRight" and "MoveAhead"is significantly more than the time consumption of other actions. Is this normal? And Do you have suggestion about how to speed up the time for performing these actions?

I simply print the time consumption for take one action:

And the result:

@winthos Thanks