If it’s a different item there shouldn’t be a delay for the normal scanners. If it’s the same item it should wait a second or two before beeping and adding the item to make sure it’s not getting scanned twice if that makes sense. The hand scanners shouldn’t have a delay.
So when a team member scans a item it checks if the upc is the same as the previous item and if so it waits 1.5 seconds then tries scanning again. Obviously nothing would turn off but the system just wouldn’t beep or add the item for 1.5 seconds to make sure it’s not a double scan.
We had a guy who was really fast. When I was running the line, I appreciated his speed because we were short on cashiers during the lockdowns and the lines were long. He pretty much only used the hand scanner. He was horribly inaccurate though. There were many times that people would come to us at GS because he did a double scan. Sometimes more than one!