Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN vs Disable CSS JS Cache

Disable CSS JS Cache is a lightweight plugin that helps WordPress developers and site administrators control browser caching for CSS and JavaScript files. Ideal for development, testing, or any time you need browsers to always load the freshest files. Key Features Cache Busting — Appends a dynamic version parameter to CSS/JS URLs so browsers skip the cache Two Busting Methods — Force Refresh (timestamp, every page load) or Smart Refresh (file modification time, only when the file actually changes) File-Type Control — Apply cache busting to both CSS & JS, CSS only, or JS only Strip Existing Version — Remove WordPress’s built-in ?ver= before adding ours, preventing duplicate parameters Per-Page Override — Disable cache busting on individual pages or posts via a meta box in the editor (new in 1.2.0) CDN Support — Optionally apply cache busting to external/CDN-hosted files Exclude Paths — Skip specific files or URL fragments Browser Caching (.htaccess) — Add long-lived Cache-Control headers for images, CSS, JS, and PDF files Configurable Cache Duration — 60 seconds up to 1 year Admin Bar Quick Toggle — One-click enable/disable from the toolbar Statistics Dashboard — See how many CSS and JS files have been processed Clear Cache Button — Flush WordPress object cache and compatible caching plugins in one click Admin Notice — Optional reminder when cache busting is active (handy for production sites) Clean Uninstall — Removes all settings and .htaccess rules when the plugin is deleted How It Works When cache busting is enabled, the plugin adds a ?ver= query string to every CSS and JS URL loaded on the frontend. Browsers treat each new URL as a fresh request, ignoring any cached copy. Choose Force Refresh for development (version changes every page load) or Smart Refresh for production (version changes only when the file timestamp changes). The optional .htaccess browser-caching feature writes Cache-Control headers so returning visitors load static assets straight from their browser cache. Use Cases Development — See theme/plugin changes instantly without clearing your browser cache Staging — Verify the latest files are loaded during QA Production — Enable browser caching for performance while still being able to bust the cache on demand Troubleshooting — Quickly rule out stale-cache issues Technical Details Developer Hooks Action do_action( ‘disable_css_js_cache_cleared’ ) — fires when the Clear Cache button is clicked. Filters (WordPress core, used by this plugin) style_loader_src, script_loader_src Constants DISABLE_CSS_JS_CACHE_VERSION — current plugin version string DISABLE_CSS_JS_CACHE_FILE — absolute path to the main plugin file DISABLE_CSS_JS_CACHE_DIR — absolute path to the plugin directory (with trailing slash) Requirements * WordPress 5.5 or higher * PHP 7.4 or higher * Apache with mod_headers (browser-caching feature only) * Writable .htaccess (browser-caching feature only)

Hummingbird makes your website faster and optimizes site performance by adding new ways to boost Google PageSpeed Insights with fine-tuned controls over file compression, deferring CSS and JavaScript styles and scripts, minify for CSS and JS, Lazy Load integration, and world-class caching. Hummingbird is brought to you by the WordPress speed specialists that created Smush image optimization, now active on more than +1 million websites. Get the complete speed boost with Hummingbird and Smush. Enjoy top-tier performance and PageSpeed optimization from the start with Hummingbird Pro. Level up immediately with exclusive Pro features like Delay JavaScript Execution, Critical CSS Generation, Brotli file compression, and 119-point global asset CDN with unlimited bandwidth. Learn more about Pro. If PageSpeed Insights is making these speed recommendations Hummingbird can help: Enable text compression – Use gzip to make your site fly (Brotli Compression via CDN included with Pro). Preconnect to required origins – Use Hummingbird to establish earlier connections. Preload key requests – Prioritize resources based on order. Avoid enormous network payloads – Consider Lazy Load for comments or breaking up smaller posts. Use efficient cache – The Hummingbird Cache suite offers effective browser cache for caching any site. Fix your JavaScript execution time – Deliver smaller JS payloads, preload JS, and defer JS. Minify CSS – Strip unused code from your CSS. Minify JavaScript – Speed up the time it takes to parse your JS files. Eliminate render-blocking resources – Move critical CSS and JS inline and defer all non-critical JS/CSS. Delay JavaScript execution (Pro only) – Increase performance by delaying the loading of non-critical JS files and scripts until user interaction. Automatically generate Critical CSS (Pro only) – Substantially boost page speed and UX by prioritizing above-the-fold content. Defer unused CSS – Defer the loading of CSS not used for above-the-fold content. Lazy Load offscreen images (Smush free integration). Hummingbird scans your site and provides one-click fixes to speed up WordPress in a flash. You’ll get faster loading pages, higher search rankings (SERP) and PageSpeed scores, and happier visitors with Hummingbird’s WordPress speed optimization. Optimizing the speed of your site has never been easier! Features Available in Hummingbird Include: Scan and Fix – Get a scan of your site, find out what’s slowing it down, and use one-click performance improvements to make critical speed improvements. World-class caching – A full caching suite to load pages faster with full-page, Gravatar, and browser cache tool. Performance Reports – Pro tips for running your site at super speed. Asset Optimization – Combine, compress and position Javascript, CSS, and Google Font files for top performance. Safe Mode — Test Hummingbird settings without affecting your visitors’ experience, only logged-in admins see the optimized version. Better Rankings – Improve scores on Google PageSpeed Insights (SEO ranking factor), YSlow, Pingdom, and GTmetrix. Increase Your Conversion Rate – Don’t keep visitors waiting: faster sites convert better. GZIP Compression – Blazing-fast HTML, JavaScript, and stylesheet (CSS) transfer. Configs – Set your preferred performance settings, save them as config, and instantly upload to any other site. Font Optimization – Improve site speed, Core Web Vitals, and visual stability by preloading critical fonts and enabling fallbacks. Uptime Monitoring & Alerts – Get instant notifications if your site ever goes down. Scheduled Performance Reports – Stay on top of site speed with regular insights. Learn The Ropes With These Hands-On Hummingbird Tutorials How To Optimize WordPress For Speed With Hummingbird How To Optimize Elementor for Free Using Smush and Hummingbird How To Optimize WPBakery Sites Using Smush And Hummingbird Speed Up and Optimize Avada for Free Using Smush and Hummingbird Optimize Divi for Free Using Smush and Hummingbird Hummingbird Features to Speed Up WordPress Scan and One-Click Fix Hummingbird is a WordPress speed optimization plugin. It will scan your site, find files that are slowing it down, and provide tips and fixes for making your site run at top speed. Hummingbird even has one-click improvements like a full cache suite, one-click minify for styles and scripts, and deferring CSS and JS for quickly optimizing performance. What could be easier! World-Class Caching You’ll get a world-class caching suite, including full-page, browser, and Gravatar cache. Make your site load even faster with Hummingbird’s complete set of cache tools that give your visitors a faster browsing experience. Including full-page, browser and Gravatar caching. Asset Optimization Did you know that loading too many files in your site’s header can slow it down? Hummingbird now gives you granular control with separate Combine and Compress optimization modes, so you can fine tune your Asset Optimization like a pro. Reorder, defer, compress and exclude CSS and JavaScript files with one-click. Transfer Data at Top Speed With GZIP Hummingbird has GZIP powers to make sharing your site more efficient. Sending zipped files is faster and can save you money on hosting. And don’t worry about setup, send Hummingbird instructions with the click of a button and she’ll handle the rest. Built-in Cloudflare Integration Hummingbird can be used to control your Cloudflare browser cache and Automatic Platform Optimizations (APO) settings as well! Simply add your Cloudflare API key and configure away. Font Optimization Boost site speed, Core Web Vitals, and the visual stability of pages for users with Hummingbird’s one-click font optimization features: Preload Fonts, which instructs browsers to preload essential fonts, and Swap Web Fonts, which applies a temporary fallback font until the primary one loads. Fully Compatible With Smush Image Optimization You can complement Hummingbird’s WordPress speed optimization features with our award-winning sister-plugin Smush image optimization. Smush compresses your images, giving your site less to load – and thus a faster load time. Hummingbird + Smush integrate perfectly together, and are the perfect match to speed up WordPress. Compress, optimize (optimise), and fix PageSpeed performance with properly sized images, lazy load, next-gen WebP convert, image formatting, and more. Save time with Hummingbird Configs Configs allow you to save your preferred Hummingbird configuration settings and apply them to your other sites in a few clicks. You can create unlimited configs. Delay Javascript Resources (Pro Only) Boost site performance dramatically by delaying the loading of JS files and third-party scripts until direct user interaction (e.g. scroll or click). Enjoy faster loading pages, improve web vitals, and ace your PageSpeed scores. Activate in one click, includes user interaction timeout and the option to exclude critical files from being delayed. A paid WPMU DEV account (the developers of Hummingbird) is required to access this feature. You can check out our affordable plans here. Generate Critical CSS (Pro Only) Maximize site speed and user experience by prioritizing only the CSS that matters most. The Generate Critical CSS feature intelligently generates and embeds critical CSS in the head of each page, giving priority to above-the-fold content and significantly improving loading speed. Updates to your critical CSS are automated with every site design change, and you can enable/disable with a click. Faster Websites Rank Higher, Convert Better Every millisecond counts: your visitors expect an ever-faster website, with a page load time of under two seconds expected – and the norm. If visitors don’t get that on your site, they will leave. If you’re running a business website or eCommerce store, that means if your website does not load quickly, you will lose sales. Hummingbird is here to help you; it’s a one of a kind WordPress performance optimization plugin that can make your site run at superspeed, for free! You get our WordPress performance optimization suite, which includes minification and GZIP for small page sizes, full caching for faster loading, and integration with Cloudflare’s APO / browser cache, and our sister-plugin Smush image optimization. Hummingbird is built with ease-of-use in mind; it makes your WordPress site faster, but it’s also fast to set up. You can scan your site and implement recommended changes in one-click, getting a fast site in mere minutes. All the above is free and will speed up WordPress for you. If you need the very fastest WordPress site, you should get a WPMU DEV Membership. Our Membership gives you access to Hummingbird Pro – which features automated scanning, enhanced minify compression (with 2x the regular optimization), CDN hosted minification – alongside Smush Pro image optimization, all our premium WordPress plugins, and 24/7 WordPress support. It’s an incredible deal, and you can find out more here. What do People say About Hummingbird? ★★★★★ “Hummingbird is so easy to use. I thought it wouldn’t change my speed much because I already made improvements. I ran the scan, it gave me recommendations, I pushed a button to apply them and it made my site even faster!” – Camilo ★★★★★ “Hummingbird is getting smarter with each update. Today it’s become so good that it forced me to remove giant cache and optimization plugins like WP Super Cache and WP Sweep because now Hummingbird includes all those features – but in a more impressive way.” – swagatam1975 ★★★★★ “Hummingbird took me from 32 to 84 on Google page speed plus made my site 50% faster on GTmetrix!” – Nicolas ★★★★★ “I just built a real bloated sack of crap of a WP site, and after configuring Hummingbird and letting it do its thing, the site is actually fast — much faster than it has any right to be…I’m impressed.” – Cacarr A Note From Hummingbird Hey! This is Hummingbird, your trusted solution to speed up WordPress. I’m part of the WPMU DEV team, a superhero-suite of WordPress plugins, services, and support. Here are some of our other free plugins: Smush – Image Compression and Optimization Forminator – Form, Quiz, Poll and Survey Builder Hustle – Pop-ups, Slide-ins and Email Opt-ins And if you need ALL our Pro plugins AND 24/7 WordPress support, get WPMU DEV membership! My superhero friends run the WPMU DEV Blog, your source for the very best WordPress tutorials. If you need to be in the know about WordPress, check it out. Thanks for looking at Hummingbird, and I look forward to flying through your site to make it faster than ever. Enjoy, The Hummingbird About Us WPMU DEV is a premium supplier of quality WordPress plugins, services and support. Join us here: https://wpmudev.com/ Don’t forget to stay up to date on everything WordPress from the Internet’s number one resource: WPMU DEV Blog Hey, one more thing… we hope you enjoy our free offerings as much as we’ve loved making them for you!