The bottleneck is where work starts waiting Most warehouse managers I've talked to think they already know where their bottleneck is. It's pick. It's pack. It's the dock doors at shift change. But when you actually map where orders are sitting — not moving, just sitting — the answer is almost never where the noise is loudest. Start with dwell time, not throughput. Pull your order timestamps and find where the gap between "arrived at this stage" and "left this stage" is widest