Starbucks' wait times have increased with higher demand for complicated cold drinks.
The company is rolling out its new "Siren System" to overhaul and streamline drink-making.
Last year the company announced its new "Siren System," a set of procedures and equipment to overhaul and streamline the drink-making process.
But the cold drinks on the menu also tend to be more complicated and take longer to make.
Only 40% of stores are expected to have the Siren System in three years time, Bloomberg recently reported.
Persons:
John Culver, baristas, Washington barista, you'll
Organizations:
Starbucks, Service, Siren, Bloomberg, —, Washington
Locations:
Wall, Silicon, Grande, California, Boston