[issue45020] Freeze all modules imported during startup.

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> Raymond, do you think we should also freeze the dependencies
> of runpy (so "python -m <module>" also starts faster)?

Yes, please.  

The '-m' load option can be considered core startup functionality.  It is often the recommended way to launch command line tools outside of a virtual environment.

   python -m pip install some_package

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