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
19276	ORM performance regression between 1.4.x and 1.5.x	Anssi Kääriäinen	nobody	"I did some benchmarking for performance regressions between 1.4 and 1.5 (using Python 2.6.7 and djangobench). I found that nearly every ORM benchmark for djangobench has regressed about 10%. I made a time series of one benchmark (query_annotate), available here: http://users.tkk.fi/~akaariai/djbench/query_annotate.html

There are two commits which show up in the graph: 
  - Minor regession for: 4a103086d5c67fa4fcc53c106c9fdf644c742dd8 (unicode literals for py3)
  - A bit larger regression for: ab6cd1c839b136cbc94178da433b2e97ab7f6061 (updated dict like datastructs for py3)

It seems there is some low-hanging fruit especially for the second commit, see here: https://github.com/akaariai/django/compare/orm_perf"	Cleanup/optimization	closed	Database layer (models, ORM)	1.5-alpha-1	Release blocker	fixed			Ready for checkin	1	0	0	0	0	0