digitalapps

This plugins detects all of the styles queued via wp_enqueue_style. Contents of each css file are copied and stored in a single css file. This file is loaded on the frontend. The plugin wp_dequeue_style and wp_deregister_style all other css files. The result is your website only makes one single http request to load css styling. Bonus feature the contents of the css file are minified.
Simply flip the switch and the plugin will do the rest.
NOTE: I have only tested this plugin on my own sites running the AdSense Theme. If you encounter a problem with this plugin please let me know. I will be able to help you.

WP CSS Merge

This plugins detects all of the styles queued via wp_enqueue_style. Contents of each css file are copied and stored in a single css file.

M Asif Rahman

WPDeveloper

Akash Mia

Your visitors decide to stay or leave in under 3 seconds. xSpeed makes sure they stay.
Most caching plugins bury you in settings, charts, and upgrade popups. xSpeed does the opposite — install it, flip one switch, and your site loads faster. No bloat, no upsells nagging you, no PhD required.
Built by the team at WPDeveloper — trusted by over 7 million WordPress users worldwide.
<h4>What Does xSpeed Do?</h4>
xSpeed is a full-site performance plugin. It caches your pages, shrinks your code, compresses your files, and serves everything as fast as your server physically can — including an AI-powered audit that tells you exactly what’s slowing your site down.
The result: pages that load in milliseconds, not seconds. Better Google PageSpeed scores. Happier visitors. Better SEO rankings.
<h4>The Speed Advantage No Other Free Plugin Offers</h4>
When xSpeed caches a page, it doesn’t just save it — it serves it directly from the server, bypassing PHP entirely.
That means:
<ul>
<li>With xSpeed static cache: 5–15ms response time</li>
<li>Without it (PHP-served cache): ~85ms response time</li>
</ul>
That’s up to 17× faster page delivery on cache hits. No other free caching plugin does this across Apache, nginx, and LiteSpeed automatically.
<h4>Features at a Glance</h4>
Page Caching
Your pages are saved as static HTML files and served instantly to visitors — before WordPress even loads. The cache rebuilds itself automatically whenever you publish a post, switch themes, or update a plugin. You never have to think about it.
<ul>
<li>Static-file rewrite path (bypasses PHP entirely — 5–15ms TTFB)</li>
<li>Auto-purge on publish, update, comment, theme change</li>
<li>One-click cache purge from the admin bar</li>
<li>Exclude specific URLs (e.g. <code>/cart</code>, <code>/checkout</code>, <code>/my-account</code>)</li>
<li>Set your own cache expiry (1–720 hours)</li>
<li>Separate mobile cache for phone and tablet visitors</li>
<li>Per-post cache rules — custom expiry or disable caching for individual posts</li>
</ul>
Code Minification
Strips all the unnecessary whitespace, comments, and characters from your HTML, CSS, and JavaScript without breaking anything.
<ul>
<li>Minify HTML, CSS, and JavaScript</li>
<li>Combine CSS and JS files to reduce HTTP requests</li>
<li>Defer or delay JavaScript so it doesn’t block page rendering</li>
<li>Async CSS loading</li>
<li>Removes <code>?ver=</code> query strings from asset URLs</li>
<li>Safe-minify: automatically skips already-minified files and falls back if anything looks off</li>
</ul>
GZIP Compression
Makes every file your server sends smaller — so browsers download them faster.
<ul>
<li>Auto-configures GZIP on Apache and LiteSpeed</li>
<li>Shows a ready-to-paste config snippet for nginx and IIS</li>
<li>Detects if your server already has GZIP active — no double-configuration</li>
</ul>
Lazy Load
Images, videos, and iframes load only when a visitor scrolls to them — not all at once on page load.
<ul>
<li>Lazy load images, iframes, and videos</li>
<li>Automatic CLS (Cumulative Layout Shift) fix so your layout doesn’t jump</li>
</ul>
Fonts Optimization
Web fonts are one of the most common causes of slow-loading pages.
<ul>
<li>Adds <code>font-display: swap</code> so text is visible immediately while fonts load</li>
<li>Preloads above-the-fold font files for instant rendering</li>
<li>Removes the blank-text flash caused by slow Google Fonts responses</li>
</ul>
Browser Cache
Tells browsers to remember your static files (images, CSS, JS) so returning visitors load your site even faster.
<ul>
<li>Sets proper <code>Cache-Control</code> and <code>Expires</code> headers</li>
<li>Works automatically — no manual configuration needed</li>
</ul>
Cache Preloader
Warms up your cache automatically so the very first visitor after a purge still gets a fast page.
<ul>
<li>Sitemap-driven cache warmer</li>
<li>Auto-warms cache when you publish or update content</li>
</ul>
Object Cache (Redis / Memcached)
Speed up database-heavy WordPress installs with server-side object caching.
<ul>
<li>Connect Redis or Memcached in seconds</li>
<li>View status and flush cache from the dashboard</li>
</ul>
CDN Support
Serve your static files from a CDN for faster global delivery.
<ul>
<li>Pull-zone URL rewriting for any CDN provider</li>
<li>Built-in Cloudflare integration: connect your zone, auto-purge on publish, toggle dev mode</li>
</ul>
Database Optimization
A bloated database slows down every page load. xSpeed keeps yours clean.
<ul>
<li>Optimize database tables</li>
<li>Remove post revisions, spam, trash, transients, and orphaned meta</li>
<li>Schedule automatic cleanup so it runs on autopilot</li>
</ul>
Disable Bloat
Turn off WordPress features you don’t use — each one is a request your server doesn’t have to make.
<ul>
<li>Disable dashicons on the frontend</li>
<li>Remove oEmbed, RSS feeds, XML-RPC, jQuery Migrate, REST API authentication headers</li>
</ul>
AI-Powered Site Audit (Pro)
xSpeed Pro scans your specific site and tells you exactly which performance features will help the most — with severity ratings and concrete reasons, not generic advice.
<h4>Smart Enough to Stay Out of Trouble</h4>
xSpeed handles the edge cases other plugins miss:
<ul>
<li>Multisite ready — each site in the network gets its own cache and settings.</li>
<li>LiteSpeed server? — xSpeed detects LiteSpeed Cache’s server module and steps back to avoid conflicts.</li>
<li>WooCommerce? — logged-in customers and checkout pages are never cached.</li>
<li>WordPress Site Health — xSpeed adds its own health check under Tools → Site Health so you always know your cache config is working correctly.</li>
<li>Works on any server — Apache, nginx, LiteSpeed, IIS, and any standard PHP host.</li>
</ul>
<h4>Designed for Everyone</h4>
Non-technical users: A 3-step setup wizard walks you through first-time configuration in under 2 minutes. Settings auto-save — there’s no Save button to forget.
Developers: REST API at <code>/wp-json/xspeed/v1/</code>, developer filters (<code>xspeed_skip_minify</code>, <code>xspeed_cache_skip_for_post</code>, <code>xspeed_cache_expiry_for_post</code>), <code>WP_DEBUG</code> awareness, and a React 18 + TypeScript admin UI under 80 KB gzipped.
Agencies: Use the <code>xspeed_branding</code> filter to white-label the dashboard for clients.
<h4>Completely Private</h4>
xSpeed never collects personal data, stores IP addresses, uses tracking cookies, or contacts any third-party server. Every optimization runs locally on your server. The only external request it makes is a quick check to your own site’s home URL to confirm GZIP is active — and even that is rate-limited to once per hour. (See “External services” below.)
<h4>Backed By a Team You Trust</h4>
xSpeed is developed by the trusted team at WPDeveloper, a leading WordPress marketplace used and loved by millions of users.
<h4>Loved xSpeed?</h4>
If xSpeed makes your site faster, please leave a review on WordPress.org — it really helps!
<h3>External services</h3>
xSpeed contacts exactly one external endpoint, and only your own site:
<h4>Self-hosted gzip probe</h4>
<ul>
<li>What it does: Issues a single <code>GET</code> request to your site’s home URL (<code>home_url('/')</code>) with an <code>Accept-Encoding: gzip</code> header to detect whether your web server is already serving gzipped responses. The response body is discarded; only the <code>Content-Encoding</code> header is read.</li>
<li>When it runs: On demand when the admin dashboard loads server status, throttled to once per hour via a transient (<code>xspeed_gzip_active</code>).</li>
<li>Where the request goes: Your own site (<code>home_url()</code>). xSpeed does not contact any third-party server, analytics endpoint, license server, or telemetry collector.</li>
<li>What is sent: No personal data, no site identifiers, no payload — just a standard HTTP <code>GET</code> from your server back to your server.</li>
</ul>
<h3>Third-party libraries</h3>
This plugin bundles the following GPL-compatible third-party libraries:
<h4>matthiasmullie/minify</h4>
Used for CSS and JavaScript minification.
<ul>
<li>Source: https://github.com/matthiasmullie/minify</li>
<li>License: MIT</li>
</ul>
<h4>matthiasmullie/path-converter</h4>
Dependency of <code>matthiasmullie/minify</code>.
<ul>
<li>Source: https://github.com/matthiasmullie/path-converter</li>
<li>License: MIT</li>
</ul>
<h4>React / React DOM / Scheduler</h4>
Used for the xSpeed admin interface bundle.
<ul>
<li>Source: https://github.com/facebook/react</li>
<li>License: MIT</li>
</ul>
<h4>lucide-react</h4>
Used for admin interface icons.
<ul>
<li>Source: https://github.com/lucide-icons/lucide</li>
<li>License: ISC</li>
</ul>

xSpeed – AI Cache & Performance Optimizer

Ultra-fast WordPress caching & performance plugin. Page cache, minify, GZIP, lazy load, fonts, object cache, CDN — one switch, no bloat, no upsells.

WP CSS Merge vs xSpeed – AI Cache & Performance Optimizer