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23 Jan 2013  
NoelDP

Microsoft Community Contributor Award Recipient

Win 7 x64 Home Premium (and x86 VirtualBox VM)
 
 

Thinking about the shape of your first graph, it reminds me a lot of the sort of bottleneck you may get from a buffer that's slow to flush.
- initial high speed as the buffer fills, then quick drop-off to a steady state as the buffer empties and is refilled.
You may want to check what all the links in the line use as buffers and see if there's some multi-tasking reserving anything.
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