performance heads up...path2id

[Robert Collins]

Quite a bit of code uses 'path2id' routinely. This is a heads up - our
current datastructure makes that call relatively expensive - we split
the path and then walk the tree. Where possible, if you are doing loops
over trees or the like, try to use id's more often, or get and hold the
inventory entry of the file you are manipulating rather than looking it
up afresh each time.

Cheers,
Rob
-- 
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