Fast fashion isn’t fast enough for Mango.

With today’s consumers demanding instant gratification, the Spanish retailer wants its fashion to respond more quickly to trends and reach stores in less time. Mango believes the vehicle for that is megastores.

The Spanish retailer, which introduced its first megastore in 2013, opened 63 last year alone and plans to continue its aggressive strategy for the remainder of 2016 and beyond. This and other nuggets of information were contained in Mango’s 2015 sustainability report, released Tuesday.

Mango isn’t the first fast-fashion retailer to put its stores on steroids. H&M in 2015 unveiled a 65,000-square-foot flagship in Manhattan’s Herald Square and Zara’s location on Fifth Avenue and 42nd Street has 43,000 square feet of space.

Mango’s megastores range from 8,611 square feet to about 32,300 square feet. One of its largest units is the 27,000-square-foot store on the Boulevard Las Ramblas in Barcelona.

In addition to physical stores, Mango has expanded the reach of its online store with markets such as South America, Asia and Africa launched last year. Online sales totaled 234 million euros, or $259.8 million, a 27 percent increase over 2014.

“[Consumers] know what they want and they want it now,” Daniel Lopez, vice chairman of Mango, said in a letter preceding the report. “This has given rise to the megastore concept, larger and more luminous stores with a renewed image.”

Megastores feature Mango’s entire range of products, including the men’s, women’s and kids’ collections and accessories.

“In the last year, we have made significant efforts to improve the positioning of our brand, consolidating the collection in all our lines and opening new megastores, which we remain committed to this year,” said chairman Isak Andic. “The development of more efficient processes, improvements to the service we offer our franchisees and strengthening our communication have also been key among our projects during 2015.”

With 2015 sales of 2.32 billion euros or $2.58 billion at current exchange, Mango has a presence in 109 countries. Of 2,730 stores, 1,138 are company-owned and 1,592 are franchised units. Foreign markets account for 81 percent of sales.

Europe accounted for 972,136 euros, or $1.08 billion in sales; Spain, 454,796 euros, or $505 million, and the rest of the world, 902,111 euros, or $1 billion. Company-owned stores contributed 1.69 billion euros, or $1.87 billion, and franchisees, 633 million euros, or $704 million.

Mango creates more than 6,500 styles per season and produces more than 142 million items per year in 885 factories. The retailer said it has adopted the G4 Global Reporting Initiative guidelines.

While China had the most factories used by Mango — 241 — the retailer noted that 25 percent of total units originated in places in close proximity to Spain such as other countries in Europe, Morocco and Turkey.

Some 396 audits were carried out last year at factories, with breaches in proportion to the number of factories: 77 in China, 73 in Turkey, 27 in Pakistan and 22 in Vietnam. Health and safety was the most frequently breached areas at 37.95 percent, followed by working hours, 30.17 percent and remuneration, 29.28 percent. Environmental offenses, child labor and freedom of association fell precipitously to 7.49 percent, 1.11 percent and 0.14 percent, respectively.

Sustainability initiatives in stores include Light-emitting Diodes (LEDs) in all new units and using lower maintenance and longer lasting building materials. Sixty percent of shopping bags are now made of recycled paper.

Mango, which in 2012 signed on to the Greenpeace Detox initiative, said its progress was positively evaluated by the organization. Last year, the retailer collected water samples from suppliers in Bangladesh, Turkey and China. Mango will next analyze the water of factories in India and South Korea.

Mango was awarded the ZeroCO2 label for production and logistics by the Ecology and Development Foundation, which updates equivalent CO2 emissions based on the Kyoto “warming potential” of greenhouse gases.

In terms of waste generated by Mango, cardboard took the lead with 70.7 percent; wood, 14.6 percent; benign matter, 10.8 percent, and recoverable mixtures, 3.3 percent.

The retailer last year launched organic cotton collections in its core Mango and Mango Baby lines and plans to extend the use of the fiber to all its lines in the coming seasons. An in-store clothing recycling product for consumers will be rolled out as a pilot this year in Spain.

Mango has 16,623 employees. Starting salaries in Spain last year were 52.5 percent higher than the government’s wage agreement. The company’s diverse work force includes more than 60 nationalities at its headquarters. About 58 percent of management and middle-management positions are occupied by women.