Why do very large files transfer so slowly over gigabit network?

FWIW I’ve just finished copying a 245GB file from Windows 7 to Server 2008. The transfer completed without any significant variation (about 60MB/Sec), and if anything increased slightly towards the end.

The Windows 7 machine was using on board Marvell, and the Server 2008 was using on board Broadcom. This was a normal Explorer copy with no tweaks to either operating system and a very average desktop switch.
 
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