[issue31415] Add -X option to show import time

[Raymond Hettinger]

Raymond Hettinger added the comment:

Naoki, is it possible to separate out how much of this is I/O vs CPU time?

If the I/O dominates, optimizations tend toward zipimports, faster drives, disk caching etc.  If the CPU time is dominant, different techniques are used (lazy evaluation, splitting-out parts of a package, etc).

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<https://bugs.python.org/issue31415>
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