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