[issue14657] Avoid two importlib copies

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

To answer MAL's question about startup, I benchmarked on my machine using the normal_startup benchmark from hg.python.org/benchmarks and the bootstrap work only caused a 5-6% slowdown in a non-debug build. If you do it in a debug build it's much worse (I think it was 12% when I benchmarked).

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<http://bugs.python.org/issue14657>
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