pure-python mercurial

[Bill Barry]

Matt Mackall wrote:
>
> Things that will be slower:
>
> revlog index parsing (> 4x)
> revlog delta generation (> 6x)
> revlog delta reconstruction (~ 10x)
> manifest parsing (> 4x)
> dirstate parsing (> 4x)
> directory traversal for status (> 4x)
> base85 encoding (40x)
>   

Is there any paths that can be taken to optimize the pure versions of 
these?  If the pure versions could be sped up to match their C 
counterparts would the pure versions become default?

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