[EricE]

"I would doubt that a register scans an item every 3.6 seconds"

Indeed, that sounds WAY too slow for me - traffic like this is bursty. Ever try to scan five of the same thing at some self check out registers? On some it's instantaneous (an awesome customer experience) on others there are one second or more delays (horrible customer experience).

Latency = friction and friction is the ultimate deal killer.

[prewett]

Walmart is the worst, it takes multiple seconds to even register that the scan worked.