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Another reason for out of order may be fragmentation. Fragment arrives out of order from rest of traffic for instance.

Out of order packets need to be put back in order at some point, usually on the receiving host.

This means memory is allocated to hold the packets in buffers while waiting for all the packets to arrive.

This also means time is "wasted" doing the reordering.

How bad this affects your traffic depends on the quantity of out of order packets, the capability of the receiving host and the type of traffic.