Server and Site Info Widget
Adds a dashboard widget with the PHP, database and WordPress versions, memory limit, upload limit and active theme at a glance.
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Server-Timing Header for Administrators
Adds a Server-Timing header with PHP time, database query count and peak memory to pages viewed by administrators, so you can read the numbers in your browser's developer tools Network tab.
Set the Maximum Upload Size for the Whole Network
Overrides the network's "Max upload file size" setting from code, so every site gets the same per-file limit regardless of what is stored in the database.
Show PHP Version, Memory and Queries in the Admin Footer
Replaces the WordPress version in the bottom right of admin screens with the PHP version, peak memory use and database query count of the current page.
Slow Database Query Warning for Admins
When SAVEQUERIES is enabled, lists the slowest database queries of the page with their duration and caller in an HTML comment visible to administrators.
Speed Up the Custom Fields Meta Box
Skips the slow database query that fills the Custom Fields key dropdown, which can freeze the classic editor on sites with lots of post meta.
Stop Crawlers Paging Endlessly Through Old Archives
Returns a "not found" page for archive pages beyond page 50 (such as /page/873/) for logged-out visitors, which keeps bots from hammering your database with very slow deep pagination queries.
Stop Yoast SEO Building Indexables on Small or Busy Sites
Turns off Yoast SEO's indexables, the background tables Yoast fills for every post and term, which removes heavy database writes on large sites or cheap hosting.
Transients Viewer Under Tools
Adds a Tools > Transients screen listing the cached transients stored in the database with their size and expiry time, and lets administrators delete a single one to force a refresh.
Trim Old Revisions, Keeping the Latest (WP-CLI)
Adds a "wp trim-revisions" command that deletes old revisions but keeps the newest few for every post. It only reports what it would delete until you add --yes.
Uptime Check Endpoint That Tests the Database
Adds a lightweight /wp-json/site/v1/ping endpoint for uptime monitors. It answers 200 only when WordPress can reach the database, and 503 otherwise, without exposing any versions.