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
25228	Performance degradation of template rendering	yml	nobody	"I noticed a performance regression after an upgrade from django `1.6.11` to `1.8.3` ; the project does an extensive usage of  `include` and `extends`. I have simplified the problem into a mini django project on github called: [https://github.com/yml/django-perfo-regression django-perfo-regression]. This project contains 2 branches (different settings) and 4 tests used to time various cases of template rendering:

* Standalone
* `include`
* `extends`
* `include` & `extends`

Depending on the settings there has been 2 major changes in the performance characteristic over the releases since django 1.4.

* `1.7` doubled the rendering time with DEBUG=True for `include`
* `1.8.3` degraded the simplified production ready (`DEBUG=False` & `cached.Loader`)

This [https://docs.google.com/spreadsheets/d/1v-cXcx8lLOF7sphtvdofU-30GmpPCyvgn1TjIRJk4OM/edit?usp=sharing spreadsheet] contains the result I am observing on my laptop."	Bug	closed	Template system	1.8	Normal	needsinfo			Unreviewed	0	0	0	0	0	0