[Python-Dev] Fixing #7175: a standard location for Python config files

[John Arbash Meinel]

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...
>  * that said, Windows seems much slower than Linux on equivalent
>    hardware, perhaps attempting to open files is intrinsically more
>    expensive there?  Certainly it's not safe to assume conclusions drawn
>    on Linux will apply equally well on Windows, or vice versa.

I don't know what the specific issue is here, but adding entries to
sys.path makes startup time *significantly* slower.

I happen to use easy_install since Windows doesn't have its own package
manager. Unfortunately the default of creating a new directory and
adding it to easy_install.pth is actually pretty terrible.

On my system, 'len(sys.path)' is 72 entries long. 62 of that is from
easy-install. A huge amount of that is all the zope and lazr.
dependencies that are needed by launchpadlib (not required for bzr itself.)

With a fully hot cache, and running the minimal bzr command:

 time bzr rocks --no-plugins
 real 0m0.395s
vs
 real 0m0.195s

So about 400ms to startup versus 200ms if I use the packaged version of
bzr (which has a very small search path).

John
=:->
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