Do we know for sure that front ends are any faster?  Their individual 
throughput limits might just be masked by having more of them spin up.

- Kris

I really don't know why backends are slow.  Maybe it has something to 
> do with the request queueing system?  Throughput sucks even when 
> backends are doing noops.  Maybe "increased concurrency" would allow 
> more requests to travel through the queueing system at once... but 
> it's hard to imagine this helping out the actual server process at 
> all.  More timeslicing and synchronization on a cpu- and memory-bound 
> problem will reduce performance, not improve it. 
>
> Jeff 
>

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