2026 · 1 version
New- Success notification when cache is cleared from the admin bar
Improved- Updated optimization labels in Hummingbird Onboarding Wizard Summary
- Enhanced Asset Optimization background file scan across all relevant locations
- Mobile-specific Above-the-Fold critical CSS is now supported on sites using Static Server Cache
- Improved caching plugin conflict detection to cover more popular caching solutions
Fixed- Browser caching only updating Images when generating the server script for individual file types
- Error in Debug log when Page caching is active
- Custom post type cache not working when "Posts" cache is disabled
- "Connect Site" button icon display issue
- Fatal error when enabling Asset Optimization after activating Safe Mode
2025 · 11 versions
3.18.1
1 improvement
New- Safe Mode now covers all plugin settings, allowing you to test any change in a sandbox environment before going live
- Ability to run performance test in the safe mode
Improved- Refined the UX for Critical CSS generation
- Enhanced Hummingbird Delay JS compatibility with Divi
- Automatically excluded specific WooCommerce files from Asset Optimization to prevent product image issues
Fixed- Resolved an issue causing excessive cache folder size
- Resolved Hummingbird Delay JS and Critical CSS conflicts with other plugins
- Bulk Update issue in Asset Optimization Dev Mode
- Minor UX and copy adjustments
3.17.1
1 fix
Fixed- Deletion of Asset Optimization database data sometimes not working
3.17.0
3 improvements9 fixes
Improved- Enhanced Hummingbird onboarding experience
- Automatically clear Page Cache after editing Site Appearance
- Improved logging for Critical CSS
Fixed- High memory usage when many minify groups are stored in the database
- Server and local cache not clearing automatically when adding a new post/page
- Cache not cleared when new comments are posted
- Some settings not resetting after clicking the "Reset" button
- Asset Optimization not stopping when the Complianz plugin is active
- Asset Optimization occasionally changing the order of styles
- Inaccurate caching stats in certain cases
- Minor visual issues
- PHP warnings
3.16.0
3 improvements1 fix
Improved- Restructure Asset Optimization modes
- Replace the Manual Asset Optimization tab with a Dev Mode link
- Asset Optimization Scan assets in the background
Fixed- Enhance core files to prevent AO file overload by other plugins
3.15.0
2 improvements4 fixes
Improved- Uptime Monitoring feature is now available for WPMU DEV Free Plan members
- Performance Notifications feature is now available for WPMU DEV Free Plan members
Fixed- Homepage display change requires manual cache clearing
- PHP warnings
- Menu item position swap and styling missing
- Hummingbird is not updating the Forminator CSS file upon form style update
3.14.1
1 fix
Fixed- Prevent duplicate injection of JS delay script
3.14.0
1 new9 fixes
New- Serve from page cache even when processes like Asset Optimization are in progress
Fixed- Cloudflare cache not cleared when post is edited
- Manual cache clearing required in certain contexts
- Manual cache clearing required to publish Elementor changes
- PHP warnings
- Delay JS Exclusions and Critical CSS Exclusions do not reset when we reset Asset Optimization settings
- Manual Inclusions (Advanced) not resetting when settings are reset
- "Clear Cache" button still appears in wp-admin when disabled
- After the Setup Wizard finishes, all WP post types are added to the Critical CSS Exclusions list
- Hamburger menu stops working on mobile when JS Delay is enabled
3.13.1
1 improvement
3.13.0
6 improvements6 fixes
Improved- Add new Google audits in Performance Test
- Whitelabel email notifications
- Ensure JS Delay, HB CDN, and Lazy Load work together
- Updated component versions
- Ensure compatibility with PHP 8.4
- Performance enhancements
Fixed- The 'Reset' option in AO Settings does not reset Critical CSS and Font Optimization settings
- WooCommerce "Disable Cart Fragments On > All Pages" is not behaving as expected
- Critical CSS generation issue for taxonomy feed pages
- Page Cache is not cleared automatically after saving menu from the Site Editor
- Static Server Cache is not clearing on post update
- Add wpdef_lockout_ to the default cookie exclusion list
New- Option to clear Static Server Cache when a post/page is updated
- UI option to exclude inline JS from the Delay JS feature
Improved- Exclude Elementor assets from Asset Optimization (AO)
- Better compatibility with The Events Calendar plugin
- New option to switch back to the legacy textarea for Exclusion Optimization (EO) exclusion keywords
- New constant to completely skip the Asset Optimization (AO) module and use Exclusion Optimization (EO) only
- Core WP files are now marked clearly in Exclusion Optimization (EO) exclusions
- Compatibility check added for WPML
Fixed- Critical CSS toggle in the Summary Box was not updating
- Delay JS Exclusions and Critical CSS Exclusions Keyword not cleared when hitting enter
- Manual Inclusions textarea expander not working on Critical CSS
- Taxonomies not excluded from Critical CSS when Categories are excluded
- Exclude files, plugins/themes and keywords from Critical CSS generation when they are added to exclusions
2024 · 3 versions
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.
- Prioritized Critical CSS generation before other CSS optimizations to prevent unexpected visual behavior.
- Removed certain autoload options to boost overall performance.
- Optimized API interactions with WPMU DEV hosting’s Static Server Cache for smoother integration.
Fixed- Debug log errors when running a Performance Test.
- Fatal error occurring when using Lazy Comments with Divi.
- Ensured compatibility with WordPress 6.7
3.10.0
2 new3 improvements1 fix
New- Option to delay below-the-fold Critical CSS until user interaction for better performance
- 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
- Better Critical CSS handling for themes which do not pass explicit IDs
- Added Critical CSS, Delay JS and Font Swapping options on the Setup wizard
Fixed- Asset Optimization Compatibility issues with Woo cart and checkout pages
3.9.4
2 improvements
Improved- Improved WPML compatibility
- Improved Static Server Cache integration stability
Changelog published by the developer, in their original language.
