notes/plan for hpss performance work

[Aaron Bentley]

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Martin Pool wrote:
>  * Perhaps surprisingly, graph operations are not showing up as
> dominant, at least in the cases we did here: pushing just one
> revision, and pushing all of history.

In my experience, graph operations are a significant portion of creating
a branch of a new project.  For example, when creating a branch of
Launchpad from scratch, Bazaar takes 20 minutes to determine that it
should fetch everything.

Please, please, please include this in your plans.

Aaron
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