Hummingbird – Optimize Speed, Enable Cache, Minify CSS & Defer Critical JS

3.12.0 ( 2025-02-12 )

• New: Option to clear Static Server Cache when a post/page is updated
• New: UI option to exclude inline JS from the Delay JS feature
• Improvement: Exclude Elementor assets from Asset Optimization (AO)
• Improvement: Better compatibility with The Events Calendar plugin
• Improvement: New option to switch back to the legacy textarea for Exclusion Optimization (EO) exclusion keywords
• Improvement: New constant to completely skip the Asset Optimization (AO) module and use Exclusion Optimization (EO) only
• Improvement: Core WP files are now marked clearly in Exclusion Optimization (EO) exclusions
• Improvement: Compatibility check added for WPML
• Fix: Critical CSS toggle in the Summary Box was not updating
• Fix: Delay JS Exclusions and Critical CSS Exclusions Keyword not cleared when hitting enter
• Fix: Manual Inclusions textarea expander not working on Critical CSS
• Fix: Taxonomies not excluded from Critical CSS when Categories are excluded
• Fix: Exclude files, plugins/themes and keywords from Critical CSS generation when they are added to exclusions

= 3.11.0 ( 2024-12-23 )
– New: Granular asset exclusion controls for Delay JS and Critical CSS, allowing easier adjustments and fine-tuning.
– Improved: Enhanced asset optimization and Critical CSS generation by ignoring empty URLs and commented CSS, reducing errors.
– Improved: Prioritized Critical CSS generation before other CSS optimizations to prevent unexpected visual behavior.
– Improved: Removed certain autoload options to boost overall performance.
– Improved: Optimized API interactions with WPMU DEV hosting’s Static Server Cache for smoother integration.
– Fixed: Debug log errors when running a Performance Test.
– Fixed: Fatal error occurring when using Lazy Comments with Divi.
– Fixed: Ensured compatibility with WordPress 6.7

3.10.0 ( 2024-10-22 )

• New: Option to delay below-the-fold Critical CSS until user interaction for better performance
• New: Separate Mobile CSS generation when using Above-the-fold Critical CSS for improved mobile performance
• Improved: Better page caching and preloading for mobile devices for improved response times
• Improved: Better Critical CSS handling for themes which do not pass explicit IDs
• Improved: Added Critical CSS, Delay JS and Font Swapping options on the Setup wizard
• Fix: Asset Optimization Compatibility issues with Woo cart and checkout pages

3.9.4 ( 2024-09-04 )

• Improvement: Improved WPML compatibility
• Improvement: Improved Static Server Cache integration stability

3.9.3 ( 2024-08-12 )

• New: Viewport Meta Optimization for better mobile performance and responsiveness
• Improvement: Font Swapping for inline CSS font declarations
• Improvement: Caching compatibility with WooCommerce Multilingual & Multicurrency by WPML
• Fix: file_get_contents preventing Hummingbird from loading scripts in JavaScript Delay module
• Fix: PHP warnings generated by Performance test
• Improvement: Redis Object Caching integration deprecated
• Improvement: Legacy manual critical CSS deprecated (Replaced with automatic Critical CSS generation)
• Improvement: Minor fixes and improvements for Static Server Cache (FastCGI) integration

3.9.2 ( 2024-07-23 )

• Improvement: Security hardening

3.9.1 ( 2024-07-15 )

• Fix: Whitelabel fixes
• Improvement: General code improvements

3.9.0 ( 2024-07-09 )

• Improvement: Better integration with WPMU Dev hosting’s Static Server Cache
• Improvement: Option to switch Font Swapping modes to fine tune performance
• Improvement: Option to switch Font Preloading modes to fine tune performance
• Improvement: Preload Caching is now enabled by default for Homepage when Page Caching is active
• Improvement: Woo cart and checkout pages are excluded from optimization to prevent broken functionality
• Improvement: Faster Critical CSS processing
• Improvement: WP 6.6 compatibility
• Fix: Google Site Kit compatibility with Asset Optimization
• Fix: Relative URLs are now handled without errors when generating Critical CSS

3.8.1 ( 2024-05-02 )

• Fix: Font optimization causes issue with RSS feeds
• Fix: PHP errors and warnings

3.8.0 ( 2024-04-29 )

• New: Load local fonts early with font preloading
• New: Font swapping to ensure that text remains visible while webfont is downloading
• Improvement: Better caching compatibility with popular third-party plugins
• Improvement: Auto-populate CDN and web font domains in Advanced Tools > Preconnect
• Fix: PHP warnings
• Fix: Delay JS compatibility issue with Avada
• Fix: Asset optimization bug fixes

3.7.4 ( 2024-03-27 )

• Improvement: Security hardening

3.7.3 ( 2024-03-21 )

• New: Replaced deprecated FID check with INP in performance test

3.7.2 ( 2024-01-16 )

• New: Use static IPs for Critical CSS service
• Improvement: Ignore missing CSS files when generating Critical CSS
• Fix: Avoid calling the Critical CSS service too frequently

3.7.1 ( 2023-12-20 )

• Improvement: Stability improvements

3.7.0 ( 2023-12-06 )

• Fix: Critical CSS and Delay JS causing validation errors with AMP
• Fix: Compatibility warning with PHP 8.3
• Improvement: Better analytics

3.6.1 ( 2023-11-06 )

• Fix: Minify module generating CSS file with HTML inside, when source CSS file not found

3.6.0 ( 2023-10-09 )

• New: Generate Critical CSS for your pages to address render-blocking resource warnings and eliminate unused CSS
• Improvement: Add comments for all translation strings that have placeholders in them
• Improvement: Set minimum required PHP version to 7.4
• Fix: PHP errors and warnings
• Fix: Asset Optimization doesn’t save settings on Manual Mode
• Fix: Delay JS conflict with Hub Client

3.5.0 ( 2023-06-27 )

• New: Delay JS – Delay the execution of scripts to prioritize page rendering
• Improvement: PHP 8.2 Compatibility
• Fix: Accessibility Improvements
• Fix: Security audit and improvements
• Fix: Filter panel overlaps result while scrolling down on Asset Optimization page
• Fix: Asset Optimization doesn’t save manual settings in some situations
• Fix: Minor improvements in code and copy

3.4.7 ( 2023-06-13 )

• Improvement: Performance improvements

3.4.6 ( 2023-04-17 )

• Improvement: Switch from React development build to production build
• Fix: Asset Optimization stats showing NaN on non-English sites
• Fix: HB CDN automatically excluding two files from Themeco Pro theme
• Fix: Hummingbird performance test results accordion not opening
• Fix: Whitelabel issue with “What’s New” modal
• Fix: Minor compatibility issues with PHP 8.2

3.4.5 ( 2023-03-28 )

• Fix: Incorrect post types getting deleted

3.4.4 ( 2023-03-15 )

• Improvement: Minor bug fixes and improvements

3.4.3 ( 2023-02-23 )

• Fix: Security fix

3.4.2 ( 2023-02-16 )

• Fix: JS error in configs

3.4.1 ( 2023-02-16 )

• Improvement: Security hardening
• Fix: Issue when upgrading from version 2.7.3

3.4.0 ( 2022-11-28 )

• New: Asset optimization safe mode
• New: React-based asset optimization module
• New: Compatibility module with WPMU DEV hosting FastCGI feature
• New: Map generated filenames to actual filenames on Manual Asset Optimisation
• New: Replace Google fonts with Bunny fonts for GDPR compliance
• Fix: Performance module showing older version of the report after scan
• Fix: Page cache preloader icon
• Fix: Uptime compatibility with WPMU DEV free Hub
• Fix: Smush activation links on MU
• Fix: Dashboard Asset Optimization Stats are different from the AO Summary Details
• Fix: Miscellaneous PHP warnings and errors

3.3.7 ( 2022-11-17 )

• Improvement: Code and compatibility improvements

3.3.6 ( 2022-11-01 )

• Enhance: Security hardening
• Enhance: WP 6.1 compatibility

3.3.5 ( 2022-10-04 )

• Enhance: Membership status check

3.3.4 ( 2022-06-16 )

• Enhance: Split out JavaScript libraries into smaller files
• Enhance: Reports compatibility with Defender masking feature
• Enhance: Cleanup on uninstall on network installs
• Enhance: Page cache compatibility with Defender security headers
• Fix: Usage tracking option on network installs
• Fix: Setup module logic on plugin activation
• Fix: Inline limits in asset optimization
• Fix: Weekly performance report sometimes sent out twice
• Fix: Settings link on Plugins page
• Fix: Comment on-click lazy loading
• Fix: Translation link URL
• Fix: Tooltip showing by default on ‘Checking files’ asset optimization modal
• Fix: Redis module not always being able to write to wp-config.php file
• Fix: Skip onboarding wizard if a config has been applied
• Fix: Rename “Basic” config to “Default”
• Fix: Tutorials scripts loading on all pages

3.3.3 ( 2022-05-12 )

• New: Set the number of comments to preload in lazy loading module
• Enhance: Clean up after uninstalling on multisite
• Enhance: Remove duplicate ‘wphb_page_cache_cleared’ action in favour of ‘wphb_clear_cache_url’
• Enhance: Sanitize input fields in Configs module
• Enhance: Compatibility with Weglot plugin
• Fix: PHP undefined array key warnings
• Fix: Fatal error when clearing cache in certain conditions
• Fix: Toggling Uptime from WPMU DEV hub
• Fix: Clear cache button not white labeled
• Fix: Onboarding setup wizard summary layout
• Fix: Onboarding setup wizard tracking option on multisite
• Fix: Smush upsell block logic
• Fix: Tutorials on dashboard page cannot be hidden
• Fix: Duplicate users in notifications modal
• Fix: Errors when offloading ES6 modules with import statements to CDN
• Fix: Clear cache button (admin bar) logic on network installs
• Fix: Cloudflare zone selector not working
• Fix: High contrast notice in comments lazy load module
• Fix: Lazy loading WooCommerce reviews

3.3.2 ( 2022-03-14 )

• Fix: XSS vulnerability

3.3.1 ( 2022-02-24 )

• New: Onboarding setup wizard
• Enhance: Support for WPMU DEV Hub
• Enhance: Add a unique salt when enabling Redis integration
• Enhance: “How does it work” section in asset optimization module
• Fix: Incorrect detection of Cloudflare APO status
• Fix: Missing action buttons on Integrations page in sub sites
• Fix: Page cache not clearing when caching is disabled on subsites
• Fix: Duplicate ID elements on dashboard page
• Fix: Inability to auto start asset optimization scan from dashboard page on free version
• Fix: Remove global configs from network subsites
• Fix: An invalid form control with name=’cloudflare-email’ is not focusable error
• Fix: Documentation link in Notifications module
• Fix: Translation strings
• Fix: Styles for Select2 textarea elements

3.3.0 ( 2022-01-11 )

• New: Font optimization is now part of automatic asset optimization mode
• New: Notification email designs
• New: Plugin icon
• Enhance: Add file size limits for inlining assets in asset optimization module
• Enhance: Status of assets in asset optimization module
• Enhance: Updating of exclusion list in asset optimization UI
• Enhance: Page types exclusions in page caching
• Enhance: PHP 8.1 compatibility
• Fix: Clearing page cache on subsites in a network sub-directory installs
• Fix: Page caching module not showing for site admins
• Fix: Browser caching module not showing on subsites with Cloudflare integration
• Fix: Cached files counter when purging cache
• Fix: Infinite loop with orphaned assets when page cache integrations are enabled
• Fix: Cases when asset optimization breaks CSS with background SVG images
• Fix: Asset optimization auto selecting files in auto mode
• Fix: Cloudflare integration when a site is installed in a sub-folder
• Fix: Missing notification modules and translations
• Fix: Errors when purging Varnish cache
• Fix: Fatal error when scheduling database reports
• Fix: Fatal error with WP Ultimo 2.x

3.2.1 ( 2021-11-24 )

• Fix: Sync issues with WPMU DEV Hub

3.2.0 ( 2021-11-24 )

• New: Notifications module and dashboard widget
• New: Performance reports for subsites
• New: Database cleanup reports
• New: Page cache integration with WP Ultimo plugin
• New: Browser caching set up wizard
• Enhance: Simplify and improve browser caching setup
• Enhance: Allow changing file location for asset optimization in multisite
• Fix: PHP warnings when syncing settings with Hub
• Fix: Parse warning in DOM when using font optimization

3.1.4 ( 2021-11-04 )

• Enhance: White labeling support
• Fix: Double notices on Dashboard page
• Fix: Translation strings

3.1.3 ( 2021-11-01 )

• Enhance: Minor performance improvements

3.1.2 ( 2021-10-19 )

• New: Option to hide average response time from Uptime reports
• Enhance: Database cleanup drafts processing – drafts are now moved to trash instead of removed completely
• Enhance: Asset optimization processing – to prevent infinite processing loops, assets that use timestamps for versions will no longer be tracked
• Enhance: Asset optimization purging orphaned data entries
• Enhance: LiteSpeed server browser cache instructions
• Enhance: Compatibility with WPMU DEV hosting FastCGI
• Fix: Asset version changes not triggering asset optimization updates
• Fix: Page cache not clearing out cache when menu is updated
• Fix: Page cache not working on a page/post if the slug is ‘mobile’
• Fix: PHP undefined offset warnings
• Fix: Hidden CPTs clearing out page cache
• Fix: Configs not working for subsite admins
• Fix: PHP warnings on Dashboard page when Smush was previously installed and removed
• Fix: Performance optimization guide link

3.1.1 ( 2021-09-07 )

• New: Import/export of asset optimization settings on network subsites
• Enhance: Page caching warnings and errors
• Enhance: Compatibility with PHP 8.1
• Fix: PHP warning in Asset Optimization module
• Fix: Error with [object Object] in Gzip module
• Fix: Page cache status when disabling the plugin on the network
• Fix: Preload key requests audit in performance test
• Fix: Performance scans not always starting in Firefox
• Fix: Cloudflare integration not detecting mapped domains on subsites
• Fix: Cloudflare modal not properly closing
• Fix: Overlapping tooltips on Asset optimization page

3.1.0 ( 2021-07-20 )

• New: Asset optimization preload option
• New: Asset optimization async option for external assets
• New: Add prefix to Redis cache via the WP_REDIS_SALT define (possible to store cache for multiple sites in a single database)
• New: DNS prefetch for asset optimization CDN
• New: Filter relevant audits in the performance test
• New: Connect to Cloudflare via API token
• Enhance: Allow setting crossorigin attribute for preconnect resources
• Enhance: Performance test score metrics weights (inline with latest Lighthouse changes)
• Enhance: Performance test tooltips
• Enhance: Make sure logging is active only when both WP_DEBUG and WP_DEBUG_LOG are set
• Enhance: Set the cache by device type option in Cloudflare APO for new installs
• Enhance: White labeling support
• Enhance: Processing of configs from other plugins
• Fix: Do not preconnect to Google fonts servers if no fonts are being optimized
• Fix: Broken purchase link in Cloudflare APO integration
• Fix: Page cache module not always showing on subsites
• Fix: Redis not connecting to external servers via hostname
• Fix: PHP warnings for undefined index original_size
• Fix: PHP warnings when doing performance scans from Dashboard
• Fix: PHP warnings array_filter() expects parameter 1 to be array
• Fix: Saving/applying settings via configs for Page Caching module on network installs

3.0.1 ( 2021-06-17 )

• New: Configs
• New: Define for controlling Redis exclusion groups
• New: Allow adding admin bar shortcuts for purging various caches
• Enhance: Move admin bar cache controls settings to the Settings – General page
• Enhance: Performance test informative audits UI
• Fix: Dashboard and Gzip compression module layout issues on mobile devices
• Fix: White pages when page cache is removed without header files
• Fix: Asset optimization empty debug link on subsites
• Fix: Documentation links
• Fix: Skip performance test button styles
• Fix: Skipping performance tests on subsites

3.0.0 ( 2021-05-19 )

• New: Performance reports (synced with latest Lighthouse API)
• New: Cloudflare automatic platform optimization (APO) integration
• New: Cloudflare integration for subsites
• New: Asset optimization font preloading
• New: Allow customizing page cache file names with a wphb_cache_* cookie
• New: Preconnect option
• Enhance: Asset optimization asset action tooltips
• Enhance: UX in Redis integration
• Enhance: Asset optimization and page cache compatibility
• Fix: Asset optimization settings reset
• Fix: Asset optimization UI inconsistencies
• Fix: Clear cache notice on network subsites
• Fix: Select element styles on reporting screens
• Fix: Overwriting network admin settings in advanced tools
• Fix: Page cache clearing taking too long during post edit
• Fix: Cloudflare browser caching settings not syncing with Hub

Changelog for previous versions.