'bzr branch -r -XXX foo bar' slow for long histories

[Aaron Bentley]

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Robert Collins wrote:
> On Sun, 2008-03-16 at 14:13 +0000, John Arbash Meinel wrote:
>> It also has the problem that our KnitPackRepositories don't cache any
>> parent information (I have a hack for maintaining the
>> CachingParentsProvider), which means it has to go back to the Index
>> each
>> time.
> 
> The index caches the parents though; and it should not be bisecting on a
> lookup of a found key.

My experience is that avoiding repeating the same node lookup is a
significant performance win.

Aaron
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