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
28459	Improve performance of QuerySet	Sergey Fedoseev	nobody	"Before:
{{{
In [2]: %timeit for x in City.objects.values_list('id'): pass
106 ms ± 2.88 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
In [3]: %timeit for x in City.objects.values_list('id', 'id'): pass
124 ms ± 846 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
}}}

After:
{{{
In [2]: %timeit for x in City.objects.values_list('id'): pass
77.7 ms ± 1.49 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
In [3]: %timeit for x in City.objects.values_list('id', 'id'): pass
95.9 ms ± 1.71 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
}}}

[https://github.com/django/django/pull/8835 PR]"	Cleanup/optimization	closed	Database layer (models, ORM)	dev	Normal	fixed			Accepted	1	0	0	1	0	0