“Six or seven weeks later, the ships come in all at once,” Mr. Lynch said. “That doesn’t help.”

Early this year, as shipping prices spiked and containers became scarce, the trouble was widely viewed as the momentary result of pandemic lockdowns. With schools and offices shut, Americans were stocking up on home office gear and equipment for basement gyms, drawing heavily on factories in Asia. Once life reopened, global shipping was supposed to return to normal.

But half a year later, the congestion is worse, with nearly 13 percent of the world’s cargo shipping capacity tied up by delays, according to data compiled by Sea-Intelligence, an industry research firm in Denmark.

Many businesses now assume that the pandemic has fundamentally altered commercial life in permanent ways. Those who might never have shopped for groceries or clothing online — especially older people — have gotten a taste of the convenience, forced to adjust to a lethal virus. Many are likely to retain the habit, maintaining pressure on the supply chain.

“Before the pandemic, could we have imagined mom and dad pointing and clicking to buy a piece of furniture?” said Ruel Joyner, owner of 24E Design Co., a boutique furniture outlet that occupies a brick storefront in Savannah’s graceful historic district. His online sales have tripled over the past year.

On top of those changes in behavior, the supply chain disruption has imposed new frictions.

Mr. Joyner, 46, designs his furniture in Savannah while relying on factories from China and India to manufacture many of his wares. The upheaval on the seas has slowed deliveries, limiting his sales.

He pointed to a brown leather recliner made for him in Dallas. The factory is struggling to secure the reclining mechanism from its supplier in China.

“Where we were getting stuff in 30 days, they are now telling us six months,” Mr. Joyner said. Customers are calling to complain.

His experience also underscores how the shortages and delays have become a source of concern about fair competition. Giant retailers like Target and Home Depot have responded by stockpiling goods in warehouses and, in some cases, chartering their own ships. These options are not available to the average small business.

Bottlenecks have a way of causing more bottlenecks. As many companies have ordered extra and earlier, especially as they prepare for the all-consuming holiday season, warehouses have become jammed. So containers have piled up at the Port of Savannah.

Mr. Lynch’s team — normally focused on its own facilities — has devoted time to scouring unused warehouse spaces inland, seeking to provide customers with alternative channels for their cargo.

Recently, a major retailer completely filled its 3 million square feet of local warehouse space. With its containers piling up in the yard, port staff worked to ship the cargo by rail to Charlotte, N.C., where the retailer had more space.

Such creativity may provide a modicum of relief, but the demands on the port are only intensifying.

On a muggy afternoon in late September, Christmas suddenly felt close at hand. The containers stacked on the riverbanks were surely full of holiday decorations, baking sheets, gifts and other material for the greatest wave of consumption on earth.

Will they get to stores in time?

“That’s the question everyone is asking,” Mr. Lynch said. “I think that’s a very tough question.”

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