July 1, 2015 8:00 pm Who Tops Mobile Performance Rankings in Boston? According to a study by RootMetrics, Boston has a new name sharing the lead in mobile performance; Vice President Julie Dey explains. US & World Videos 1:32 Amber Alert for 2 NH girls canceled, father in custody 2:53 Latest on Lewiston, Maine shootings 2:01 Local researchers looking to turn plastic into fuel 1:45 Gov. Healey to sign bottle ban order for state agencies 2:41 Leominster students return to school after floods