I never understand how super speed helps doing certain things.
Barry cooked all that food super fast. But unless the pans and toasters and the oven also cooks at super speed, he is limited to how fast he can cook.
Like one episode when he goes to pick up a pizza and is back in like 3 seconds. Unless the pizza was waiting for him, and he just threw the money on the counter and left, there would be no way he could run to the place, ask for the pizza, wait for the guy to give him the pizza, pay for the pizza and run back in three seconds.
Its a cute bit but just couldn't work.