Odd notebook performance behavior

[Eric Rescorla]

Hi folks,

You might be interested in the following notebook:
https://gist.github.com/ekr/5dbd14316554c87ebecf49dec3c2b543

The behavior I see in the last cell (un-named) is that it takes 2 minutes
(there are about 750k records) but the progress indicator jumps up to
636 processes done and then grinds away until it hits 640. I don't know
if this is too slow or not (it seems a bit slow) but this seems indicative
that maybe we're not making good us of the cluster, so I thought I
would mention it.

-Ekr
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