[Bug 1814791] Re: dput's sftp method is very slow

[Julian Andres Klode]

We should probably also or only adjust the reads to be 64 KiB large. I'm
not sure if the sftp code is always buffering - I'd hope if I pass it
really large buffers like that, that it just uses those directly, rather
than buffer again.

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Title:
  dput's sftp method is very slow

Status in dput package in Ubuntu:
  Confirmed

Bug description:
  Distributor ID:	Ubuntu
  Description:	Ubuntu 18.04.1 LTS
  Release:	18.04
  Codename:	bionic
  dput:           1.0.1ubuntu1

  New dput's sftp method is very slow, ~1.5Mbit/s, after some
  investigation I found that increasing buffer size up to 65536 increase
  upload speed up to ~8Mbit/s, but this is still much slower than old
  method.

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