Starbucks promises its new 'siren system' will cut the wait for your drink — but most stores are still waiting for the rollout

Starbucks promises its new 'siren system' will cut the wait for your drink — but most stores are still waiting for the rollout

Starbucks wait times have increased along with demand for cold drinks.SOPA Images/Getty Images <ul> <li>Starbucks' wait times have increased with higher demand for complicated cold drinks.</li> <li>… [+2944 chars]

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