2017年07月19日 15:22 GMT+02:00 Oleg Broytman <[email protected]>: > On Wed, Jul 19, 2017 at 02:59:52PM +0200, Victor Stinner > <[email protected]> wrote: >> "Python is very slow to start on Windows 7" >> https://stackoverflow.com/questions/29997274/python-is-very-slow-to-start-on-windows-7 > > However hard you are going to optimize Python you cannot fix those > "defenders", "guards" and "protectors". :-) This particular link can be > excluded from consideration.
Sorry, I didn't read carefully each link I posted. Even for me knowing what Python does at startup, it's hard to explain why 3 people have different timing: 15 ms, 75 ms and 300 ms for example. In my experience, the following things impact Python startup: * -S option: loading or not the site module * Paths in sys.path: PYTHONPATH environment variable for example * .pth files files in sys.path * Python running in a virtual environment or not * Operating system: Python loads different modules at startup depending on the OS. Naoki INADA just removed _osx_support from being imported in the site module on macOS for example. My list is likely incomplete. In the performance benchmark suite, a controlled virtual environment is created to have a known set of modules. FYI running Python is a virtual environment is slower than "system" python which runs outside a virtual environment... Victor _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com