View debugging and performance information on database queries, hooks, conditionals, HTTP requests, redirects and more.
By default, Query Monitor's output is only shown to Administrators on single-site installs, and Super Admins on Multisite installs.
In addition to this, you can set an authentication cookie which allows you to view Query Monitor output when you're not logged in (or if you're logged in as a non-administrator). See the bottom of Query Monitor's output for details.
Short answer: Yes, but only a little.
Long answer: Query Monitor has a small impact on page generation time because it hooks into a few places in WordPress in the same way that other plugins do. The impact is negligible.
On pages that have an especially high number of database queries (in the hundreds), Query Monitor currently uses more memory than I would like it to. This is due to the amount of data that is captured in the stack trace for each query. I have been and will be working to continually reduce this.
In addition, Query Monitor transparently supports add-ons for the Debug Bar plugin. If you have any Debug Bar add-ons installed, just deactivate Debug Bar and the add-ons will show up in Query Monitor's menu.
Please use the issue tracker on Query Monitor's GitHub repo as it's easier to keep track of issues there, rather than on the wordpress.org support forums.
No, I do not accept donations. If you like the plugin, I'd love for you to leave a review. Tell all your friends about the plugin too!
Requires: 3.5 or higher
Compatible up to: 4.3.1
Last Updated: 2015-8-8
Active Installs: 10,000+
9 of 10 support threads in the last two months have been resolved.
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