On Thu, 24 May 2018, Sean Miller wrote:

> Your educated guess was correct. Log with patch applied to 7.55.1 is
> attached. Original observed delay is gone.
>
> What delays remain are probably network latency.

Awesome! I think the fix could be slightly more polished (since it now sets
the socket to wait for read + write unconditionally without checking
specifically which one the underlying functions actually want), but I think
I'll leave that improvement for a future rainy day! =)

I've pushed this fix as a PR now in https://github.com/curl/curl/pull/2600 and
once it passes the tests there, I'll merge to master.

Thanks for your reports and logs!

-- 
  / daniel.haxx.se
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