Performance Lab Plugin

The Performance Lab plugin is a collection of features focused on enhancing performance of your site, most of which should eventually be merged into WordPress core. The plugin allows to individually enable and test the features to get their benefits before they become available in WordPress core, and to provide feedback to further improve the solutions.

Installation from within WordPress

1. Visit Plugins > Add New.
2. Search for Performance Lab.
3. Install and activate the Performance Lab plugin.

Manual installation

1. Upload the entire performance-lab folder to the /wp-content/plugins/ directory.
2. Visit Plugins.
3. Activate the Performance Lab plugin.

After activation

1. Visit the new Settings > Performance menu.
2. Enable the individual features you would like to use.

3.3.0

Enhancements

• Bump minimum WP versions and WP version tested up to. (1333)
• Improve message for WebP site health test. (1249)
• Remove ‘Requires at least’ and ‘Requires PHP’ from plugin readmes. (1334)
• Upgrade PHPStan to 1.11.6. (1325)

Bug Fixes

• Extend core’s Autoloaded Options Site Health test if present (in WP 6.6). (1298)
• Generate phpunit-multisite.xml on the fly. (1327)

3.2.0

Enhancements

• Add install note after each PerfLab feature plugin in the plugin list table. (1265)
• Update plugins with new banners and icons. (1272)

Bug Fixes

• Fix Server-Timing compatibility with other plugins that do output buffering. (1260)
• Harden autoloaded-options site health test for incorrectly implemented external object cache plugins. (1238)

3.1.0

Enhancements

• Add progress indicator when activating a feature. (1190)
• Display plugin settings links in the features screen and fix responsive layout for mobile. (1208)
• Add plugin dependency support for activating performance features. (1184)
• Add support for AVIF image format in site health. (1177)
• Add server timing to REST API response. (1206)
• Bump minimum PHP requirement to 7.2. (1130)
• Refine logic in perflab_install_activate_plugin_callback() to rely only on validated slug. (1170)
• Improve overall code quality with stricter static analysis checks. (775)

Bug Fixes

• Avoid passing incomplete data to perflab_render_plugin_card() and show error when plugin directory API query fails. (1175)
• Do not show admin pointer on the Performance screen and dismiss the pointer when visited. (1147)
• Fix WordPress.DB.DirectDatabaseQuery.DirectQuery warning for Autoloaded Options Health Check. (1179)

3.0.0

Enhancements

• Add caching to the wordpress.org query to get plugin information. (1022)
• Add support for autoloading enhancements in WordPress 6.6 trunk to autoloaded options Site Health check. (1112)
• Bump minimum required WordPress version to 6.4. (1062)
• Enhance object-cache.php drop-in placement logic to support updating to a newer version of the file. (1047)
• Implement support for annotating certain plugins as experimental. (1111)
• Migrate Site Health checks from being modules to becoming part of the plugin core. (1042)
• Remove modules infrastructure and UI from the plugin. (1060)
• Support changing autoload value for largest autoloaded options in Site Health check. (1048)
• Use plugin slug for generator tag. (1103)

Documentation

• Update tested WordPress version to 6.5. (1027)

2.9.0

Features

• Infrastructure: Add standalone plugin version constants for auto-sizes and speculation-rules. (958)

Enhancements

• Infrastructure: Include standalone plugin slugs in generator tag. (949)

Bug Fixes

• Infrastructure: Sanitize metric name for Server-Timing header. (957)

2.8.0

Features

• Infrastructure: Introduce UI for managing Performance Lab standalone plugins. (864)

Enhancements

• Infrastructure: Add support for plugin live preview in the plugin directory. (890)
• Infrastructure: Allow module can-load.php callbacks to return a WP_Error with more information. (891)
• Infrastructure: Implement admin pointer to indicate to the user they need to migrate modules to their standalone plugins. (910)
• Infrastructure: Implement migration logic and UI from Performance Lab modules to their standalone plugins. (899)
• Infrastructure: Reset admin pointer dismissal for module migration when the user activates a module. (915)

Bug Fixes

• Infrastructure: Fix construction of translation strings in admin/plugins.php. (925)

2.7.0

Enhancements

• Images: Remove Fetchpriority module as the functionality is now available in WordPress core. (854)
• Infrastructure: Bump minimum required PHP version to 7.0 and minimum required WP version to 6.3. (851)

Documentation

• Infrastructure: Publish Image Placeholders standalone plugin. (842)

2.6.1

Bug Fixes

• Infrastructure: Remove PHPStan config file from plugin directory. (816)

Documentation

• Infrastructure: Add standalone plugin assets. (815)

2.6.0

Features

• Infrastructure: Add output buffering checkbox to Server-Timing screen. (801)
• Infrastructure: Implement logic to measure specific hook execution time with Server-Timing controlled by a WP Admin screen. (784)

Enhancements

• Images: Fix incorrect function prefixes in Image Placeholders. (789)
• Infrastructure: Add early exit clauses to files with procedural code. (790)
• Infrastructure: Allow disabling Server-Timing entirely using PERFLAB_DISABLE_SERVER_TIMING constant. (795)

Bug Fixes

• Images: Fix WebP handling when editing images based on WordPress 6.3 change. (796)
• Infrastructure: Fix errors detected by Plugin Checker. (788)

2.5.0

Enhancements

• Images: Check for fetchpriority feature being available in WordPress core before loading the module. (769)
• Database Optimization: Remove SQLite module. (764)
• Infrastructure: Bump tested up to version to 6.3. (772)

2.4.0

Enhancements

• Database: Implement migration prompt to migrate from SQLite module to standalone plugin due to removal in the following release. (739)
• Infrastructure: Enhance code quality by adding PHPStan and fixing level 0 issues. (730)
• Infrastructure: Use static closures for minor performance improvement whenever instance access is not needed. (729)

Bug Fixes

• Database: Fix SQLite module deactivation routine to make standalone plugin migration work correctly. (743)
• Infrastructure: Make Server-Timing header output more robust. (736)

2.3.0

Enhancements

• Images: Configure Dominant Color and Fetchpriority modules for their standalone plugins. (704)
• Infrastructure: Temporarily remove Image Placeholders from standalone plugins.json definition. (719)
• Infrastructure: Use dynamic version from plugins.json for manual workflow. (710)

Bug Fixes

• Images: Add dominant color styling before any existing inline style attributes. (716)
• Infrastructure: Resolve low-severity security advisory GHSA-66qq-69rw-6×63.

2.2.0

Enhancements

• Images: Remove “experimental” flag from Fetchpriority module. (702)
• Infrastructure: Implement infrastructure for launching standalone plugins from modules, including Modern Image Formats. (699)
• Infrastructure: Include WordPress-Extra rules in PHPCS configuration and fix resulting problems. (695)

Bug Fixes

• Images: Sanitize target param before using it. (690)

Documentation

• Images: Change module slug/directory from dominant-color to dominant-color-images. (708)
• Images: Rename Dominant Color module to Dominant Color images. (705)

2.1.0

Enhancements

• Infrastructure: Add wp-total metric to default Server-Timing metrics. (669)
• Infrastructure: Ensure module load.php files really only load other code to prevent conflicts in standalone plugins. (674)

Bug Fixes

• Infrastructure: Fix problems with placing object-cache.php drop-in. (672)

2.0.0

Enhancements

• Object Cache: Update WordPress version to 6.1 and remove Cache modules. (641)
• Measurement: Add perflab_disable_object_cache_dropin filter. (629)
• Database: Add an indicator in the adminbar to show when using SQLite. (604)

Bug Fixes

• Images: Check for existing $metadata['sizes'] to fix PHP warning. (648)
• Images: Use correct number of arguments in filter callback. (634)
• Database: Fix invalid docs and return types as highlighted by static analysis. (645)
• Infrastructure: Fix incorrect usage of plugin_action_links_* filter. (647)

Documentation

• Infrastructure: Add file header to object-cache drop-in to clarify purpose. (649)

1.9.0

Enhancements

• Database: Remove warning about multi-server environment from the SQLite module description. (619)

Bug Fixes

• Infrastructure: Enhance object-cache.php drop-in interoperability with other plugins. (616)

1.8.0

Features

• Measurement: Implement Server-Timing API foundation as well as basic load time metrics. (553)
• Database: Implement new experimental SQLite integration module. (547)
• Images: Implement new experimental fetchpriority module. (528)

Bug Fixes

• Database: Fix SQLite notices related to undefined properties. (600)
• Database: Fix incorrect handling of admin_email and actual admin user’s email when original admin_email user was deleted. (603)
• Database: Make WP filesystem setup more robust to prevent potential errors. (595)

1.7.0

Enhancements

• Images: Change WP Image editor quality for mime types. (571)
• Infrastructure: Introduce database focus area, rename JavaScript focus area to JS & CSS, and phase out Site Health focus area. (566)

Bug Fixes

• Images: Avoid potentially adding invalid attributes or duplicates for dominant color images. (578)
• Images: Fix fatal error in REST API response when an image has no attachment metadata. (568)
• Images: Fix image focal point bug when dominant color is enabled by not overriding style attribute. (582)
• Images: Fix opt-in checkbox for generating WebP and JPEG to also show on Multisite. (565)

1.6.0

Enhancements

• Site Health: Only load Site Health checks for persistent cache and full page cache when not available in core. (543)
• Images: Add checkbox to Settings > Media to control whether to generate JPEG in addition to WebP. (537)
• Images: Generate only WebP images by default for JPEG and WebP uploads. (527)
• Infrastructure: Bump minimum WordPress requirement to 6.0. (549)

1.5.0

Enhancements

• Site Health: Improve autoloaded options check by highlighting largest autoloaded options. (353)

1.4.0

Enhancements

• Images: Enhance JS replacement mechanism for WebP to JPEG to more reliably replace full file name. (443)
• Images: Introduce webp_uploads_get_content_image_mimes() to get content image MIME replacement rules. (420)
• Infrastructure: Add PERFLAB_PLUGIN_DIR_PATH constant for plugin_dir_path(). (429)
• Infrastructure: Rename Site Health check modules for language and consistency. (423)

Bug Fixes

• Site Health: Fix incorrect usage of badge colors in all Site Health checks. (472)
• Images: Add the original image’s extension to the WebP file name to ensure it is unique. (444)
• Images: Fix REST API support for plain permalinks. (457)
• Infrastructure: Remove plugin option network-wide for Multisite during uninstall. (458)

1.3.0

Enhancements

• Images: Add replacing of images only in frontend context. (424)
• Images: Allow control for which image sizes to generate additional MIME type versions. (415)
• Images: Discard WebP image if it is larger than corresponding JPEG image. (418)
• Images: Optimize computing dominant color and transparency for images by combining the two functions. (381)
• Images: Provide fallback JPEG images in frontend when WebP is not supported by the browser. (360)
• Images: Rely on wp_get_image_editor() methods argument to check whether it supports dominant color methods. (404)
• Images: Remove experimental label from Dominant Color module and turn on by default for new installs. (425)
• Site Health: Remove perflab_aea_get_resource_file_size() in favor of wp_filesize(). (380)
• Site Health: Update documentation link for autoloaded options. (408)
• Infrastructure: Implement mechanism to not load module if core version is available. (390)

Bug Fixes

• Images: Ensure incorrect usage of webp_uploads_upload_image_mime_transforms filter is treated correctly. (393)
• Images: Fix PHP notice and bug in logic for when webp_uploads_prefer_smaller_image_file filter is set to true. (397)
• Images: Fix an infinite loop in the WebP fallback mechanism. (433)
• Images: Fix dominant color upload process to not override potential third-party editors. (401)
• Images: Remove additional image backup sources & sizes files when attachment deleted. (411)
• Infrastructure: Avoid including .husky directory in plugin ZIP. (421)
• Infrastructure: Do not show admin pointer in multisite Network Admin. (394)

1.2.0

Features

• Images: Add Dominant Color module to provide color background for loading images. (282)
• Site Health: Add Site Health check for Full Page Cache usage. (263)

Enhancements

• Images: Update webp_uploads_pre_generate_additional_image_source filter to allow returning file size. (334)
• Infrastructure: Introduce plugin uninstaller routine. (345)
• Infrastructure: Use wp_filesize instead of filesize if available. (376)

Bug Fixes

• Images: Avoid overwriting existing WebP files when creating WebP images. (359)
• Images: Back up edited full image sources when restoring the original image. (314)

1.1.0

Features

• Infrastructure: Add Performance Lab generator meta tag to wp_head output. (322)

Enhancements

• Images: Introduce filter webp_uploads_pre_generate_additional_image_source to short-circuit generating additional image sources on upload. (318)
• Images: Introduce filter webp_uploads_pre_replace_additional_image_source to short-circuit replacing additional image sources in frontend content. (319)
• Images: Refine logic to select smaller image file in the frontend based on webp_uploads_prefer_smaller_image_file filter. (302)
• Images: Replace the featured image with WebP version when available. (316)
• Site Health: Update Site Health Autoloaded options documentation link. (313)
• Infrastructure: Avoid unnecessarily early escape of Site Health check labels. (332)

Bug Fixes

• Object Cache: Correct label for persistent object cache Site Health check. (329)
• Images: Only update the specified target images when an image is edited. (301)

1.0.0

Features

• Images: Generate secondary image MIME types when editing original image. (235)

Enhancements

• Images: Introduce webp_uploads_prefer_smaller_image_file filter allowing to opt in to preferring the smaller image file. (287)
• Images: Select MIME type to use in frontend content based on file size. (243)
• Site Health: Update Site Health reports copy for more clarity and consistency. (272)

Documentation

• Infrastructure: Define the plugin’s version support and backward compatibility policy. (240)

1.0.0-rc.1

Enhancements

• Images: Change expected order of items in the webp_uploads_content_image_mimes filter. (250)
• Images: Replace images in frontend content without using an additional regular expression. (262)
• Images: Restore and backup image sizes alongside the sources properties. (242)

Bug Fixes

• Images: Select image editor based on WebP support instead of always using the default one. (259)

1.0.0-beta.3

Bug Fixes

• Infrastructure: Ensure default modules are loaded regardless of setting registration. (248)

1.0.0-beta.2

Features

• Images: Create additional MIME types for the full size image. (194)
• Site Health: Add module to warn about excessive amount of autoloaded options. (124)

Enhancements

• Images: Adds sources information to the attachment media details of the REST response. (224)
• Images: Allow developers to select which image format to use for images in the content. (230)
• Images: Allow developers to tweak which image formats to generate on upload. (227)
• Images: Replace the full size image in the_content with additional MIME type if available. (195)
• Object Cache: Include memcached extension in checks for object cache support. (206)
• Infrastructure: Add plugin banner and icon assets. (231)
• Infrastructure: Use .gitattributes instead of .distignore to better support ZIP creation. (223)

Bug Fixes

• Images: Use original image to generate all additional image format sub-sizes. (207)
• Infrastructure: Replace unreliable activation hook with default value for enabled modules. (222)

Documentation

• Infrastructure: Update release instructions to include proper branching strategy and protect release branches. (221)

1.0.0-beta.1

Features

• Images: Add WebP for uploads module. (32)
• Images: Support retry mechanism for generating sub-sizes in additional MIME types on constrained environments. (188)
• Images: Update the_content with the appropriate image format. (152)
• Site Health: Add WebP support in site health. (141)
• Site Health: Add module to alert about excessive JS and CSS assets. (54)
• Object Cache: Add Site Health check module for persistent object cache. (111)
• Infrastructure: Add settings screen to toggle modules. (30)
• Infrastructure: Added admin pointer. (199)

Enhancements

• Object Cache: Always recommend object cache on multisite. (200)
• Images: Create image sub-sizes in additional MIME types using sources for storage. (147)
• Images: Update module directories to be within their focus directory. (58)
• Site Health: Enhance detection of enqueued frontend assets. (136)
• Infrastructure: Add link to Settings screen to the plugin’s entry in plugins list table. (197)
• Infrastructure: Enable all non-experimental modules on plugin activation. (191)
• Infrastructure: Include generated module-i18n.php file in repository. (196)
• Infrastructure: Introduce perflab_active_modules filter to control which modules are active. (87)
• Infrastructure: Remove unnecessary question marks from checkbox labels. (110)
• Infrastructure: Rename object-caching to object-cache. (108)

Bug Fixes

• Images: Ensure the -scaled image remains in the original uploaded format. (143)
• Images: Fix typo to access to the correct image properties. (203)
• Infrastructure: Ensure that module header fields can be translated. (60)

Documentation

• Site Health: Mark Site Health Audit Enqueued Assets module as experimental for now. (205)
• Infrastructure: Add readme.txt and related update script. (72)
• Infrastructure: Add changelog generator script. (51)
• Infrastructure: Add contribution documentation. (47)
• Infrastructure: Add release documentation. (138)
• Infrastructure: Define module specification in documentation. (26)