[joelkevinjones]

Calculating transfer rates based on time-stamps is ridiculous. At any point from source to destination, the individual files making up the emails could have been aggregated, transferred, and then disaggregated, potentially multiple times. Preserving time meta-data during these sorts of operations can go wrong even when one is trying to preserve it. The delta file times could simply reflect the transfer rate of the final disaggregation step in the chain. This could have been a from a directly connected storage device over a less than full-disk-speed interface, or from such a device accessed over a network.