To finish my timing work I decided to see where Py_InitializeEx_Private() spends its time. The following is a breakdown measured in microseconds running using -E:
INIT: setlocale: 11 envvar: 2 random init: 2 interp creation: 15 thread creation: 6 GIL: 10 _Py_ReadyTypes(): 930 more types: 44 builtins: 141 exceptions: 287 sys: 258 _PyImport_Init: 15 import hooks: 4 _PyWarnings_Init(): 15 ENTERING import_init(): PyImport_ImportFrozenModule(_frozen_importlib): 1186 interp->importlib: 6 PyInit_imp(): 15 _imp: 3 importlib._install(): 876 _PyImportZip_Init(): 130 _PyFaulthandler_Init(): 13 time: 3 ENTERING initfsencoding(): codec lookup: 2179 signals: 120 tracemalloc: 7 __main__: 13 initstdio(): 1568 warnings module: 4 initsite(): 9552
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