# Performance improvements

**URL:** <https://forum.ansible.com/t/performance-improvements/22207>\
**Category:** Ansible Developer\
**Created:** [August 3, 2016, 9:58pm UTC](https://forum.ansible.com/t/performance-improvements/22207 "2016-08-03T21:58:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![James\_Cammarata](https://avatars.discourse-cdn.com/v4/letter/j/7c8e57/32.png) [@James\_Cammarata](https://forum.ansible.com/u/James_Cammarata)\
**Post date:** [August 3, 2016, 9:58pm UTC](https://forum.ansible.com/t/performance-improvements/22207/1 "2016-08-03T21:58:34Z")

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Hi all, I’ve dedicated this week to begin looking into some of the performance issues people have reported since 2.0 was released, and I have a working branch I’d like some testing against:

[https://github.com/ansible/ansible/compare/performance\_improvements](https://github.com/ansible/ansible/compare/performance_improvements)

Notably, there are improvements related to problems reported in #12239 and #16749. The later is very interesting, as it highlighted a exponential decay in performance when nesting includes (it became very noticeable once you got over 7 layers deep) using dynamic includes for recursion. As noted in the issue, at 30 levels deep it took about 1.5 hours to finish - this branch does the same in under 5 seconds.

There are a few known issues with this branch:

- The algorithm for queueing tasks can starve and deadlocks if the number of workers is \< the number of inventory hosts. Still looking into that (I’m somewhat surprised that this didn’t happen with the old code, as the changes were relatively minor there).
- Per-item callbacks are broken.

Thanks, and let me know if you run into bugs while testing this!