Query Monitor

4.0.6 (11 April 2026)

Version 4 of Query Monitor adds a new timeline view, and switches from rendering its panels server-side in PHP to efficiently rendering them client-side in Preact.

Version 4.0.6 fixes a compatibility issue with the GeneratePress theme.

More information at querymonitor.com/4.

4.0.5 (10 April 2026)

Version 4 of Query Monitor adds a new timeline view, and switches from rendering its panels server-side in PHP to efficiently rendering them client-side in Preact.

Version 4.0.5 fixes the following:

• Ensures closing script tags within data don’t break the output
• Adds “Doing it Wrong” data to the timeline view

More information at querymonitor.com/4.

4.0.4 (10 April 2026)

Version 4 of Query Monitor adds a new timeline view, and switches from rendering its panels server-side in PHP to efficiently rendering them client-side in Preact.

Version 4.0.4 fixes the following:

• Ensures the Scripts panel remains visible when no scripts are enqueued in the header
• Corrects the display of number formatting in some locales

More information at querymonitor.com/4.

4.0.3 (9 April 2026)

Version 4 of Query Monitor adds a new timeline view, and switches from rendering its panels server-side in PHP to efficiently rendering them client-side in Preact.

Version 4.0.3 fixes the following:

• Improves compatibility with plugins that perform non-UTF8 queries or make other use of non-UTF8 data
• Avoids a PHP warning for undefined file and line number in some stack trace frames
• Simplifies and standardises the format of names used for closure callbacks
• Improves styling and layout of the timeline view

More information at querymonitor.com/4.

4.0.2 (9 April 2026)

Version 4 of Query Monitor adds a new timeline view, and switches from rendering its panels server-side in PHP to efficiently rendering them client-side in Preact.

Version 4.0.2 fixes the following:

• Adds further backwards compatibility for third-party plugins that read from the QM data collectors and output their own panels
• Adds transient updates to the timeline view

More information at querymonitor.com/4.

4.0.1 (7 April 2026)

Version 4 of Query Monitor adds a new timeline view, and switches from rendering its panels server-side in PHP to efficiently rendering them client-side in Preact.

• Version 4.0.1 fixes a backwards compatibility issue with plugins that register their own menus or sub-menus in Query Monitor.

More information at querymonitor.com/4.

4.0.0 (7 April 2026)

Version 4 of Query Monitor adds a new timeline view, and switches from rendering its panels server-side in PHP to efficiently rendering them client-side in Preact. This new approach provides several benefits:

• Performance is greatly increased, particularly on sites where a large number of queries are performed, a large number of PHP errors are triggered, or a large amount of data is collected in one of the other panels.
• Further future enhancements are facilitated, such as displaying client-side metrics, lazy-loading data, showing data from different requests, and more remixing of data into different views.
• The raw data collected by Query Monitor has been reduced in size and memory usage, and is now exposed to the page as JSON. Take a look at the QueryMonitorData object in your browser console to play around with it.

More information at querymonitor.com/4.

3.20.4 (19 March 2026)

• This is a security release which fixes a reflected XSS vulnerability in the Request panel. Full details in the security advisory.

3.20.3 (17 March 2026)

• Clicking QM in the the admin toolbar a second time will now close the panel
• Improvements to accessibility of the toggle buttons
• Failed HTTP API GET requests now show a clickable link

3.20.2 (11 December 2025)

• Prevents a PHP error being triggered under certain conditions and when no database queries are performed.

Earlier versions

For the changelog of earlier versions, refer to the releases page on GitHub.