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  • Andrey Golovanov thinks this is interesting:

With current routers carrying voice and multimedia traffic, the reordering of packets increases the end-to-end delay affecting user experience.


Cover of Network Routing, 2nd Edition


It's actually not the most important problem. The real problem is that TCP's recovery from out of order packets is not free, it affects goodput by causing retransmissions. Basically, the impact of out of order packets on goodput is similar to the impact of packet loss.