mikegleasonjr / divi-extra-bug-report

Extra theme performance bug report

This is a minimal project running a fresh copy of Wordpress 5.2.2 with the default database as of July 2019. This has been tested with a fresh copy of the Extra theme v2.26.3.

What has been added:

• A test user with the password test.
• 25 main categories, with each one having 10 sub-categories and 5 sub-sub-categories (see migrations/00013_fill_categories.up.sql).
• The plugin Query Monitor has been added to show the performance bugs.
• All other plugins have been deleted
• Only one article is present (the default one when installing Wordpress)

Running instructions

Software requirements

• Docker
• docker-compose

Extra theme

The Extra theme is needed and not provided (for obvious reasons). After copying the Extra theme folder into the project, you should have a directory tree looking like this:

This has been tested with a fresh copy of the Extra theme v2.26.3.

.
├── Extra          <---- Added by you
├── README.md
├── docker-compose.yaml
├── migrations
├── query-monitor
└── run.sh

Running the test site

On Linux or OSX:

$ ./run.sh

On Windows:

docker-compose run --rm wait_for_database
docker-compose run --rm migrations
docker-compose up wordpress

After running the commands, you should be able to go to http://localhost:8080/.

bug #1 (frontpage)

1. log in with the test user at http://localhost:8080/wp-admin (password: test)
2. return back to the website at http://localhost:8080/
3. click on the Query Monitor data on the admin bar (the numbers on the right of Edit layout):
4. open the Duplicate Queries tab of Query Monitor
5. check the amount of queries made:

Bug #1: 60 duplicated mysql calls being made to WP_Query->get_posts to render the front page. On my site in production, I have over 2000 duplicated calls and the page takes 15 seconds to render despite being on a dedicated host (dual core) with 2GB of RAM. Adding an object cache does nothing as those queries apparently were not cached.

bug #2 (categories)

1. log in with the test user at http://localhost:8080/wp-admin (password: test)
2. return back to the website at http://localhost:8080/
3. click on any category
4. click on the Query Monitor data on the admin bar (the numbers on the right of Edit layout)
5. open the Duplicate Queries tab of Query Monitor
6. check the amount of queries made:

Bug #2: 58 duplicated mysql calls being made to WP_Query->get_posts to render a category (even with no articles in the category). On my site in production, I have over 2000 duplicated calls and the page takes 15 seconds to render despite being on a dedicated host (dual core) with 2GB of RAM. Adding an object cache does nothing as those queries apparently were not cached.

Conclusion

There is clearly a performance issue regarding categories. This minimal project containing only one article and 25 main categories clearly shows it.