Which 1957 McDonald's branding phrase promised customers that they would be served “in a flash”?

The Speedee Service System was the 1957 McDonald's branding phrase associated with being served “in a flash.”

The term described the restaurant operating model developed from the McDonald brothers' streamlined system. It emphasized a limited menu, standardized preparation, and quick service, ideas that helped define the modern fast-food format.

McDonald's adopted the phrase as it expanded beyond the original San Bernardino operation. Speedee branding connected the restaurant's name, mascot, and promise: customers were meant to understand that food would be prepared efficiently and consistently.

The wording is sometimes confused with “Quality, Service and Cleanliness,” a later service-oriented corporate motto. The Speedee Service System was specifically tied to the early fast-service concept and to the Speedee mascot, before later campaigns shifted attention toward family entertainment and emotional slogans.