Final answer:
The critical action performed by the EMS team that will expedite the patient's care on arrival and reduce time to treatment is to provide prehospital notification.
Step-by-step explanation:
The critical action performed by the EMS team that will expedite the patient's care on arrival and reduce the time to treatment, according to the Adult Suspected Stroke Algorithm, is Prehospital notification allows the receiving hospital to prepare for the patient's arrival and activate the stroke team, ensuring that the necessary resources and specialists are available when the patient arrives. This early notification can significantly reduce the time to treatment and improve outcomes for stroke patients.