[This message was posted by Marc Battyani of HPC Platform 
<marc.batty...@hpcplatform.com> to the "FAST Protocol" discussion forum at 
http://fixprotocol.org/discuss/46. You can reply to it on-line at 
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> that I don't really have a good answer for. This doesn't mean that any
> of the questions is relevant, but I find them "interesting" in a way:
> 
> - What is the "exact" processing overhead of FAST field and transfer
>   encoding respectively?
[...] 
> But given different work loads, what are the _actual_ numbers?

Here are some actual numbers from our system in production for Eurex and Xetra:
The total time from the end of the incoming multicast packet to the start of 
the output packet: 480ns for the whole packet with a standard deviation of 
around 200ns.

This includes the multicast stack, the FAST decoding, the order-book processing 
and reconstruction, the output generation and the output multicast stack.

CME will be similar.

So yes, FAST is fast :)

Marc


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