That won't fix it, because it is a systematic issue with attention to
external contributions that can only be fixed at core level.
dstufft> There's been 4 or 5 other PRs that have done this same thing,
including some from myself. I don't need to have the tests run again
to know it's going to be 2x-3x slower.
https://github.com/pypa/pip/pull/2646#issuecomment-90484333
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anatoly t.