Nearly six months since McDonald’s opened its first CosMc’s location, the hours-long drive-thru lines have died down, but the chain is just getting started.

The burger giant created the spinoff using one of its lesser-known McDonaldland mascots, CosMc, an alien who loves McDonald’s cheeseburgers. While unveiling CosMc’s at an investor event in December, McDonald’s CEO Chris Kempczinski said the company set out to create a brand that could sell customizable drinks and coffee popular in the afternoon segment to attract younger consumers.

The new brand rollout comes as beverages are increasingly “looked at now as part of that snack area — more affordable, indulgent and perhaps even a healthier treat,” said Katie Belflower, an editor at restaurant research firm Technomic. “It’s a good profit margin for restaurants. With beverages, you can get really creative, without necessarily having the product lines that you would have to invest in with food.”

Since opening the initial location in the Chicago suburb of Bolingbrook, McDonald’s has opened three more CosMc’s restaurants, all in Texas. For now, the chain is planning to open 10 locations by the end of this year for a test run, with all but one located in the Lone Star State.

In another sign of the new brand’s expansion, it will launch its own mobile app and loyalty program, called CosMc’s Club, on Tuesday. Customers can use the app to place orders that they pick up either inside the restaurant or in the drive-thru lane. And loyalty program members earn 10 points for every dollar they spend; once they rack up 400 points, they can redeem them for $2 rewards.

While the long-term fate of CosMc’s is still too soon to tell, the gamble could pay off for McDonald’s even if the spinoff never makes it past the 10-location test phase. The app and loyalty program will give the chain even more consumer insight.

“The cost of doing this, to McDonald’s, is a rounding error. Even if they shut them all down six months from now, they still learn some things. Sometimes the learnings can be more valuable than you might imagine they would be,” Mark Kalinowski, restaurant industry analyst and chief executive of Kalinowski Equity Research, told CNBC.

At McDonald’s December investor presentation, Kempczinski downplayed the short-term effect of CosMc’s.

“Let me emphasize again, we’re talking about 10 stores,” he said at the event. “The big story isn’t about CosMc’s, per se. The big story is what it says about McDonald’s and our potential.”

But for many consumers, CosMc’s was the headline. When the first location opened days later in Illinois, eager customers waited for hours in drive-thru lines that dragged around the shopping center for the chance to buy McPops and Churro Frappes.

Weeks later, the buzz had started dying. According to Intouch Insight, the average wait time from entering the CosMc’s drive-thru line to reaching the speaker to order was 11 minutes and 13 seconds, based on visits from mystery shoppers in January and February. But the average service time, after ordering, was just four minutes and one second, trailing the industry benchmark by just six seconds.

On a Monday afternoon in May, there was no line for this CNBC reporter to reach one of the four drive-thru intercoms to place an order.

Investors’ interest has also cooled as other parts of McDonald’s business draw more attention.

“Six months ago, there was a lot of curiosity, but now that you’ve seen McDonald’s same-store sales decelerate, that’s where my clients’ focus is,” Kalinowski said.

In the first quarter, McDonald’s reported U.S. same-store sales growth of 2.5%, a slowdown as price increases fade and diners pull back their restaurant spending.

From the outside, the CosMc’s location in Bolingbrook isn’t much to look at. Four drive-thru lines await customers to place their orders. The building’s indigo exterior features the brand’s name — but no sign of its namesake mascot.

In fact, while CosMc plays an outsize role in the brand’s fictional origin story on the CosMc’s website, he’s basically invisible from its branding or restaurant.

“He is not as well-known of a character,” Belflower said. “I think that’s almost to their benefit, because people can understand how CosMc’s is different from McDonald’s itself — but it still has a retro font and coloring and things like that, so I think all of that helps tie it into the nostalgia.”

CosMc’s absence could also be due to the fact that the chain’s target customer likely wasn’t born yet when McDonald’s advertisements featuring CosMc aired in the ’80′s and ’90’s. 

“Just in looking at the menu, it looks like it’s designed for half my age and under,” said Kalinowski, whose industry experience spans more than two decades.

CosMc’s customers can choose from a vast array of drinks and a smaller snack menu. Sour Cherry Energy Burst, Island Pick-Me-Up Punch and Popping Pear Slush are among the beverages that McDonald’s created specifically for the chain.

Drinks, like a Tropical Spiceade, can be customized with “boosts,” like a vitamin C shot or an energy shot, tapioca pearls known as boba or a choice of eight different syrups. The chain also offers coffee drinks — like its Churro Cold Brew Frappe, whose largest size contains nearly five times the amount of caffeine found in an average cup of brewed coffee.

CosMc’s is also the latest example of a beverage-focused restaurant that doesn’t just sell coffee. There’s Utahan soda chain Swig, now majority-owned by Larry Miller’s family office. Dutch Bros gets about a quarter of its sales from its Blue Rebel energy drink. And Starbucks’ Refreshers, first introduced a dozen years ago, are the chain’s fastest-growing beverage category in the U.S., with new spicy flavors available this spring.

Non-coffee drinks tend to appeal more to consumers looking for a pick-me-up in the afternoon. While they still might want caffeine, a flavored beverage like a Blueberry Ginger Boost from CosMc’s might be more appealing than another coffee.

CosMc’s level of customization would be difficult at a traditional McDonald’s because it would slow down its drive-thru lanes too much. For example, Starbucks has credited the shift to cold drinks and pricy customizations, like cold foam, for its sales growth in recent years, but both customers and baristas have griped about complicated orders slowing service too much.

One way to speed up CosMc’s service could be using its digital menu boards differently. The CosMc’s menu board plays ads until a car pulls up next to the nearby intercom, leaving customers little time to ponder the menu of more than 70 drinks and food items. The launch of mobile and online ordering will likely also help speed up wait times.

Once customers finish ordering, they can pay at the speaker or wait to pay with a cashier at the pick-up window. CosMc’s also has customers wait by the intercom where they ordered until their order is ready to pick up. The menu board relays what pick-up window to drive up to grab the order.

Envisioned as a small-format location, CosMc’s doesn’t offer any in-restaurant seating, leaving it up to customers to sit in the 10-spot parking lot or keep driving. The Bolingbrook CosMc’s, a former Boston Market location, is much larger than McDonald’s intends for the rest of the brand’s locations. But with empty real estate, a 45-minute drive from the company’s Chicago headquarters and a traditional McDonald’s right next door, it makes sense why the company chose that location as the first spot for the spinoff.

But the location’s history is also a warning for McDonald’s. The company bought Boston Market out of bankruptcy in 2000, intending to use its real estate. But it instead kept running the brand.

Seven years later, McDonald’s sold it off, following a broader divestment in other secondary brands like Chipotle Mexican Grill. At the time, McDonald’s sales were struggling, and executives blamed some of its woes on a lack of focus.