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Data from the software provider Freightos shows average vessel arrival in December was 5.2 days late at West Coast ports, compared to 1.7 days in September.
Port of New York and New Jersey terminals have seen additional containers from "extra loaders."
The Commerce Department has concluded there's both dumping and subsidization of these imports from China.
A strike could come as soon as Monday, according to a statement from Teamster affiliate Justice for Port Truck Drivers.
Carriers should not be allowed to profit from congestion for which they are at least partially responsible, says agriculture group.
The 10-ship loop will call in South China, Vietnam, Colombo, New York, Savannah and Norfolk, and is designed to provide fast transit from Asia to New York.