The great thing in life is efficiency. If you amount to anything in the world, your time is valuable, your energy precious. They are your success capital, and you cannot afford to heedlessly throw them away or trifle with them.
When you expand a business as fast as McDonald's did, part of the strength you have is the process and the efficiency.
Efficiency is key to a successful kitchen. Clean your station as you go. Make yourself aerodynamic. Buy the best. Taste ingredients as you go.