[New-bugs-announce] [issue29645] webbrowser module import has heavy side effects

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

`import webbrowser` has heavy side effects. It searches a number of executables. On X Window it also runs external program xdg-settings.

Cold start:

$ time ./python -c ''

real	0m1.719s
user	0m0.088s
sys	0m0.036s

$ time ./python -c 'import webbrowser'

real	0m5.713s
user	0m0.308s
sys	0m0.196s

Hot start:

$ time ./python -c ''

real	0m0.094s
user	0m0.072s
sys	0m0.020s

$ time ./python -c 'import webbrowser'

real	0m1.026s
user	0m0.284s
sys	0m0.100s

----------
components: Library (Lib)
messages: 288551
nosy: serhiy.storchaka
priority: normal
severity: normal
status: open
title: webbrowser module import has heavy side effects
type: performance
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29645>
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