Hummingbird is a performance optimization plugin from WPMU DEV that combines page caching, file minification, critical CSS generation, and performance reporting. It scans your site and provides a list of performance issues with one-click fixes, making it beginner-friendly while still offering advanced controls for experienced users. The plugin includes full-page caching, browser caching, Gravatar caching, asset optimization for CSS and JS, GZIP compression, and Cloudflare integration. For WPMU DEV ecosystem users, Hummingbird integrates with their Smush image optimization plugin for a complete performance solution. It competes with WP Rocket and LiteSpeed Cache in the caching space, with the advantage of being part of the WPMU DEV suite.
The Pro version adds delay JavaScript execution, critical CSS generation, Brotli compression, and a 119-point global CDN.
Competitive Features
- Page caching — full-page cache with automated cache purging on content updates
- Asset optimization — combine, minify, and position CSS and JavaScript files
- GZIP compression — compress HTML, CSS, and JavaScript for faster transfer
- Critical CSS (Pro) — generate above-the-fold CSS to improve page load speed
- Delay JavaScript (Pro) — defer non-critical JavaScript until user interaction
- Performance reports — automated scans with actionable recommendations
- Cloudflare integration — control Cloudflare cache and APO settings from WordPress
Key Features
- Cache suite — full-page, browser, and Gravatar caching with configurable expiry
- Asset optimization — granular control over CSS and JS files with combine, minify, and position options
- Safe mode — test optimization settings without affecting visitor experience
- Uptime monitoring — monitor site availability with instant alerts
- Font optimization — preload critical fonts and enable font-display swap
- Configs system — save and apply performance settings across multiple sites
- Scheduled reports — receive regular performance reports via email
Comparison with Competitors
Hummingbird vs WP Rocket
| Aspect | Hummingbird | WP Rocket |
|---|---|---|
| Page caching | Yes | Yes |
| Critical CSS | Pro only | Via add-on |
| CDN | Pro (119-point) | Third-party |
| Performance reports | Yes | No |
| Uptime monitoring | Yes | No |
| Safe mode | Yes | No |
Bottom line: The free version of Hummingbird is more limited than WP Rocket, but the WPMU DEV membership includes Hummingbird Pro plus all other WPMU plugins. The safe mode testing feature is unique to Hummingbird.
Recommended Stack: Hummingbird handles caching and performance. For image optimization alongside speed, use the companion Smush Pro plugin from WPMU DEV for compressed images.
Official Changelog
Data sourced from WordPress.org plugin repository.
Version 3.21.2
Release Date: September 1, 2026
- Fix: Performance Test Notification Report is not sent.
- Fix: Security hardening.
Version 3.20.0
Release Date: July 20, 2026
- New: Critical CSS generation module with automated updates on theme changes.
- Enhancement: Delay JavaScript execution with user interaction timeout.
- Updated: Cloudflare integration for APO and browser cache settings.
Version 3.19.0
Release Date: June 15, 2026
- Added: Font optimization module with preload and swap settings.
- Improved: Asset optimization with granular file exclusions.
- Performance optimization for the admin interface on multisite.
Frequently Asked Questions
Does Hummingbird have a free version?
Yes. The free version includes page caching, asset optimization, GZIP compression, and performance reports. The Pro version (part of WPMU DEV membership) adds critical CSS, delay JavaScript, Brotli compression, and CDN.
How does safe mode work?
Safe mode lets you enable performance optimizations that only affect logged-in admins. Visitors see the unoptimized site while you test changes. When you’re satisfied, push the changes live.
Does Hummingbird work with Cloudflare?
Yes. Hummingbird integrates with Cloudflare’s API, allowing you to control browser cache, APO (Automatic Platform Optimization), and cache settings from your WordPress dashboard.
What is the WPMU DEV membership?
WPMU DEV is a membership service that includes Hummingbird Pro, Smush Pro, Defender Pro, and all other WPMU DEV plugins plus 24/7 support. Pricing starts at $49/month.
Does Hummingbird support lazy loading?
Yes. Hummingbird includes lazy loading for images. For advanced image optimization features, it integrates with the companion Smush plugin.
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