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> but mostly for networking and then second to that storage, with the cost for actual computation usually being a pretty small percentage of my overall spend.

What portion of the bandwidth is end-user facing and what portion of it is connecting all the servers? Another way of asking this is if I need fewer servers because code runs faster, how much less bandwidth do I need?

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AWS doesn't charge for internal server-to-server transfers, so the answer is precisely 0.

That's only true for transfer in the same availability zone.

https://aws.amazon.com/ec2/pricing/on-demand/#Data_Transfer_...

Availability and horizontal scale-out are separate axes, so that isn't relevant for this question.

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