id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
31599	Improve the performance of the autoreloader by ignoring third party packages.	Tom Forbes	nobody	"In https://github.com/django/django/pull/12750 and https://code.djangoproject.com/ticket/30372 we stopped watching the translation files that Django ships, to improve the performance of the autoreloader.

I believe we can go a step further and stop monitoring all third-party packages for changes by using the sysconfig module: https://docs.python.org/3/library/sysconfig.html. With this we can get a list of different Python system directories, for example:

{{{
	data = ""/Users/tom/PycharmProjects/github/orf/django/venv""
	include = ""/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/include/python3.7m""
	platinclude = ""/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/include/python3.7m""
	platlib = ""/Users/tom/PycharmProjects/github/orf/django/venv/lib/python3.7/site-packages""
	platstdlib = ""/Users/tom/PycharmProjects/github/orf/django/venv/lib/python3.7""
	purelib = ""/Users/tom/PycharmProjects/github/orf/django/venv/lib/python3.7/site-packages""
	scripts = ""/Users/tom/PycharmProjects/github/orf/django/venv/bin""
	stdlib = ""/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7""
}}}

We could simply not watch any path under the `purelib` directory to start. This would exclude a huge number of files from being watched - Django alone has 824 individual files that would be excluded, and it's safe to assume that a large project with many third party dependencies would have several thousand.

This would be a breaking change - personally I sometimes find myself navigating into third party code and making small changes while debugging, and I'm sure others do this from time to time. However I don't think it's a common occurance for most developers and I'm not sure everyone paying a cost is worth the benefit to a small number of people."	Cleanup/optimization	closed	Utilities	dev	Normal	wontfix			Unreviewed	0	0	0	0	0	0