CHICAGO — McDonald's plans to introduce fresh beef burgers in all U.S. restaurants by early May, the fast-food chain's latest move aimed at drawing customers, boosting sales and propelling the business into the future.

Quarter Pounders and Signature Crafted burgers will be made with patties that are cooked upon ordering. All other burgers, including the Big Mac, will continue to be made with patties that are prepared in advance and then frozen. The announcement follows 18 months of testing to refine the cooking process so it doesn't result in longer wait times for customers, said Chris Kempczinski, McDonald's USA president.

“McDonald's is known for speed and convenience. What we had to figure out is how do you cook only when someone orders it, but do it in a way that doesn't impact service times. When people come to McDonald's, they're not going to wait five minutes for a burger,” Kempczinski said at a media event at an Oak Brook McDonald's on Monday night.

Fresh beef is already available in some 3,500 restaurants in various markets across the U.S., but it won't be available in Chicago until the beginning of May, the company said. The company tested the new offering at locations in Texas and Oklahoma.

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For McDonald's customers, any impact to serving time and price will be minimal, Kempczinski said. For the Golden Arches, the hope is to sustain and even accelerate the company's turnaround. Under Steve Easterbrook, who took over as CEO in 2015, McDonald's has unleashed an array of changes to make the Oak Brook-based chain more contemporary and relevant to today's consumers.

Since the long-awaited launch of all-day breakfast, also in 2015, the Golden Arches has started mobile ordering and delivery, modernized thousands of its U.S. restaurants, introduced premium menu items and overhauled its value menu, among other changes. This spring, McDonald's is also planning to move from its longtime headquarters in Oak Brook to new corporate offices in Chicago's Fulton Market district.

Kempczinski, a former Kraft Foods Group executive who also joined McDonald's in 2015, compared the operational challenge of rolling out fresh beef at all 14,000 U.S. restaurants to that of launching all-day breakfast. Time will tell if the impact is similar, as all-day breakfast provided a significant boost to sales and foot traffic.

“I'd love similar results to all-day breakfast, but the customer will ultimately decide,” Kempczinski said.

The timing of the announcement could help bolster Wall Street confidence after a recent slide to start the year.

On Friday, shares of McDonald's stock fell almost 5 percent after analysts at RBC Capital Markets disappointed with the early performance of the chain's new $1 $2 $3 Dollar Menu lowered sales and earnings estimates for the company.