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 has changed a feature that helps them map out their trip around the store to pick up items. Instead of providing a set route that made the best use of a shopper's time, as the app used to do, the Spark app now tracks the worker's location in the store and rearranges the list of items based on their proximity. Four Spark drivers said the feature is slowing them down.