SAN RAFAEL, CA - MARCH 12: Customers order food at a McDonald's restaurant drive thru on March 12, 2013 in San Rafael, California. McDonald's has retained its number one ranking in both global and domestic sales and continues to be the largest single restaurant brand in the world with company-store sales last year of $4.53 billion and franchise-store sales of $31.063 billion for a domestic total of $35.59 billion. (Photo by Justin Sullivan/Getty Images)
LAS VEGAS (KTNV) — When it comes to the drive-thru, who really is fast food?
The "Drive-Thru Performance Study" done by QSR magazine reveals the fastest and not so fast when it comes to getting food at the window.
Dunkin' Donuts was among the fastest while McDonald's was among the slowest.