Walmart delivery workers say a new app feature is sending them running around stores — and wasting precious time

A feature in Walmart's Spark app is slowing down some delivery workers. Scott Olson/Getty Images Walmart revised a feature in its Spark app that helps delivery workers find products in-store. Spark delivery workers say it wastes time when filling delivery orders. Walmart has spent years trying to deliver orders faster using its stores. A new feature in Walmart's Spark app is slowing the chain's delivery efforts, workers say. The Spark delivery workers told Business Insider that Walmart's app…