3 ms·

So why does it take 5-10 seconds from card presented to accepted at Starbucks and CVS?

• kasey_junk 2mo ago
  Usually the dominant time is from POS to acceptor. These are frequently still on high latency links. Also a lot of times in person payment flows allow a lot more in their latency budget because it won’t impact the sale, you won’t walk out because of a second here or there, unlike online. So systems aren’t as optimized, they route to older systems, marketing or further risk checks are added, and a broader range of accepted services that have higher latency (ent/snap processors and the like).
• jameshart 2mo ago
  This scenario does not include payment. Would be much more interesting if it did.