QuantumCache vs xSpeed Cache – AI-Powered Performance Hub with MCP, Caching & CDN

QuantumCache accelerates WordPress by caching database query results and content fragments used to build pages. Instead of caching entire HTML pages, it reduces the database work required to render pages while preserving WordPress’s native invalidation behavior. It is not an output buffer or page cache, and it does not replace existing page caching solutions. Features Caches the results of the main front-end WP_Query for anonymous requests. Tag-based invalidation: purge by post ID, post type, or taxonomy. Fragment caching for the_content (classic) and core blocks such as core/post-content, core/latest-posts, core/archives, and core/navigation. Multiple storage modes: Auto – use Redis if available, otherwise fall back to MySQL. Redis – fastest mode; uses the PHP Redis extension. MySQL – portable fallback using compact tables (qc_entries, qc_tagmap). Compatible with the Redis Object Cache drop-in. Avoids wp_options and postmeta storage – all cache data is stored in Redis or QuantumCache-owned database tables. Multisite-aware: per-site prefixes and per-site tables. WP-CLI commands: wp quantumcache flush and wp quantumcache status. Metrics data layer: persistent hit, miss, store, and purge event counters available via Metrics::totals() and Metrics::deltas(). Performance summary In benchmarks on a plugin-heavy WordPress site (WooCommerce + Yoast SEO), QuantumCache reduced per-request database queries by up to ~99% on cached pages and achieved cache hit rates exceeding 97% with Redis. In the benchmark environment: Redis mode reduced warm TTFB by roughly 23–27% and total response time by 18–21% versus an uncached baseline. MySQL fallback mode delivered modest improvements (~3–10%) when Redis was unavailable. Actual results depend on theme complexity, plugin load, database topology, and traffic patterns. When to use QuantumCache QuantumCache is useful when: Your site already uses a page cache (such as a CDN, reverse proxy, or caching plugin) but WordPress still performs significant database work. You want faster response times without relying solely on full-page caching. Your hosting environment supports Redis, or you want a portable MySQL fallback. QuantumCache complements page caching rather than replacing it. What QuantumCache does NOT do QuantumCache is not a page cache or full HTML cache. It does not replace solutions such as: * CDN caching * reverse proxy caches * traditional WordPress page caching plugins Instead, QuantumCache reduces the database work required to build pages, making those systems more effective. Debug headers (optional) Enable Settings → QuantumCache → Send X-QC debug headers to view cache status in HTTP responses: * X-QC-Main: HIT | MISS | STORE * X-QC-Store: AUTO | redis | mysql * X-QC-Hydrated: number of posts loaded from cache Append ?qc_nocache=1 to any URL to bypass caching for that request. Debug headers are sent only when explicitly enabled in settings and contain no personal or user-specific data. WP-CLI commands QuantumCache provides the following WP-CLI commands: wp quantumcache status Shows the active backend, storage mode, and lifetime cache counters. wp quantumcache flush Clears all cache entries for the current site. Use –yes to skip the confirmation prompt. QuantumCache Pro QuantumCache Pro extends the core engine with advanced caching capabilities for WooCommerce and logged-in users. See: https://quantumcache.io Privacy QuantumCache does not collect, send, or log personal data. It stores cache entries in Redis or its own MySQL tables. Other plugins on your site may handle cookies or data independently. No remote requests are made, and no data is transmitted to external servers.

Your visitors decide to stay or leave in under 3 seconds. xSpeed Cache makes sure they stay. Most caching plugins bury you in settings, charts, and upgrade popups. xSpeed Cache 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. What Does xSpeed Cache Do? xSpeed Cache 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. The Speed Advantage No Other Free Plugin Offers When xSpeed Cache caches a page, it doesn’t just save it — it serves it directly from the server, bypassing PHP entirely. That means: With xSpeed static cache: 5–15ms response time Without it (PHP-served cache): ~85ms response time That’s up to 17× faster page delivery on cache hits. No other free caching plugin does this across Apache, nginx, and LiteSpeed automatically. Features at a Glance 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. Static-file rewrite path (bypasses PHP entirely — 5–15ms TTFB) Auto-purge on publish, update, comment, theme change One-click cache purge from the admin bar Exclude specific URLs (e.g. /cart, /checkout, /my-account) Set your own cache expiry (1–720 hours) Separate mobile cache for phone and tablet visitors Per-post cache rules — custom expiry or disable caching for individual posts Code Minification Strips all the unnecessary whitespace, comments, and characters from your HTML, CSS, and JavaScript without breaking anything. Minify HTML, CSS, and JavaScript Combine CSS and JS files to reduce HTTP requests Defer or delay JavaScript so it doesn’t block page rendering Async CSS loading Removes ?ver= query strings from asset URLs Safe-minify: automatically skips already-minified files and falls back if anything looks off GZIP Compression Makes every file your server sends smaller — so browsers download them faster. Auto-configures GZIP on Apache and LiteSpeed Shows a ready-to-paste config snippet for nginx and IIS Detects if your server already has GZIP active — no double-configuration Lazy Load Images, videos, and iframes load only when a visitor scrolls to them — not all at once on page load. Lazy load images, iframes, and videos Automatic CLS (Cumulative Layout Shift) fix so your layout doesn’t jump Fonts Optimization Web fonts are one of the most common causes of slow-loading pages. Adds font-display: swap so text is visible immediately while fonts load Preloads above-the-fold font files for instant rendering Removes the blank-text flash caused by slow Google Fonts responses Browser Cache Tells browsers to remember your static files (images, CSS, JS) so returning visitors load your site even faster. Sets proper Cache-Control and Expires headers Works automatically — no manual configuration needed Cache Preloader Warms up your cache automatically so the very first visitor after a purge still gets a fast page. Sitemap-driven cache warmer Auto-warms cache when you publish or update content Object Cache (Redis / Memcached) Speed up database-heavy WordPress installs with server-side object caching. Connect Redis or Memcached in seconds View status and flush cache from the dashboard CDN Support Serve your static files from a CDN for faster global delivery. Pull-zone URL rewriting for any CDN provider Built-in Cloudflare integration: connect your zone, auto-purge on publish, toggle dev mode Database Optimization A bloated database slows down every page load. xSpeed Cache keeps yours clean. Optimize database tables Remove post revisions, spam, trash, transients, and orphaned meta Schedule automatic cleanup so it runs on autopilot Disable Bloat Turn off WordPress features you don’t use — each one is a request your server doesn’t have to make. Disable dashicons on the frontend Remove oEmbed, RSS feeds, XML-RPC, jQuery Migrate, REST API authentication headers 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. Smart Enough to Stay Out of Trouble xSpeed Cache handles the edge cases other plugins miss: Multisite ready — each site in the network gets its own cache and settings. LiteSpeed server? — xSpeed Cache detects LiteSpeed Cache’s server module and steps back to avoid conflicts. WooCommerce? — logged-in customers and checkout pages are never cached. WordPress Site Health — xSpeed Cache adds its own health check under Tools → Site Health so you always know your cache config is working correctly. Works on any server — Apache, nginx, LiteSpeed, IIS, and any standard PHP host. Designed for Everyone 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 /wp-json/xspeed/v1/, developer filters (xspeed_skip_minify, xspeed_cache_skip_for_post, xspeed_cache_expiry_for_post), WP_DEBUG awareness, and a React 18 + TypeScript admin UI under 80 KB gzipped. Agencies: Use the xspeed_branding filter to white-label the dashboard for clients. Private By Default xSpeed Cache never collects personal data, stores IP addresses, or uses tracking cookies. Every optimization runs locally on your server. By default it makes no calls to any third-party server — the only request is a quick check to your own site’s home URL to confirm GZIP is active, rate-limited to once per hour. xSpeed Cache also includes optional usage analytics. The setup wizard shows a clearly-labeled consent control for it (enabled by default, untick to opt out), and nothing is sent until you confirm your choices in the wizard. When enabled, xSpeed Cache shares anonymous, non-sensitive diagnostics — your WordPress & PHP version, active theme & plugins, server type, site language, and which xSpeed Cache features you have switched on — so we know what to keep fast and compatible. No personal data and no page content are ever sent, and you can turn it off again at any time from your dashboard. (See “External services” below.) Backed By a Team You Trust xSpeed Cache is developed by the trusted team at WPDeveloper, a leading WordPress marketplace used and loved by millions of users. Loved xSpeed Cache? If xSpeed Cache makes your site faster, please leave a review on WordPress.org — it really helps! External services xSpeed Cache contacts your own site (the gzip probe below); when usage analytics is enabled, an analytics service; only if you choose to submit the optional deactivation survey, that same service; and — only if you turn it on — one external performance-score provider. The setup wizard shows a clearly-labeled consent control for analytics (enabled by default, untick to opt out), and nothing is sent until you confirm your choices there. The deactivation survey is separate and never sends anything unless you explicitly click Submit. External scores are off by default and never run on their own. Self-hosted gzip probe What it does: Issues a single GET request to your site’s home URL (home_url('/')) with an Accept-Encoding: gzip header to detect whether your web server is already serving gzipped responses. The response body is discarded; only the Content-Encoding header is read. When it runs: On demand when the admin dashboard loads server status, throttled to once per hour via a transient (xspeed_gzip_active). Where the request goes: Your own site (home_url()). This request goes only to your own server. What is sent: No personal data, no site identifiers, no payload — just a standard HTTP GET from your server back to your server. Usage analytics (opt-in, off by default) What it does: When usage analytics is enabled, xSpeed Cache periodically sends anonymous, non-sensitive diagnostics to help us keep the plugin fast and compatible with real-world WordPress environments. Data sent: site URL, site name, WordPress version, PHP version, site language & charset, multisite flag, server software, your list of active & inactive plugins, active theme & version, text direction, and your xSpeed Cache feature usage (which optimization features you have switched on and their numeric settings — e.g. cache lifetime, minification, lazy-load). This is feature-usage data only: it tells us which features are actually used so we can focus on what matters. We never send any values you enter — no API keys, tokens, passwords, license keys, email addresses, URLs, brand names, or logos — and no page content, no visitor data, and no personal data (your email is never collected in the free plugin). When it runs: It runs at most once per day via WP-Cron, only after you confirm your choices in the setup wizard. Untick the consent control (or disable it later from the dashboard) and nothing is ever sent. Where the request goes: WP Insights, WPDeveloper’s usage-analytics service — https://send.wpinsight.com/process-plugin-data. (Privacy Policy) How to turn it off: Untick the consent control in the wizard, or disable it later from the xSpeed Cache dashboard. Opting out stops all data collection and clears the scheduled task. External performance scores (opt-in, off by default) What it does: Lets you run a performance audit of one of your own pages from the dashboard and shows the score alongside xSpeed Cache’s internal TTFB benchmark. Two providers are supported: Google PageSpeed Insights (works without an API key; you may add your own key to raise Google’s anonymous rate limit) and GTmetrix (requires your own API key — it has no anonymous mode). When it runs: Only when you press Test now on the dashboard, or run wp xspeed score run. There is no schedule and no background call. If the feature is left off — which is the default — no request is ever made. Where the request goes: Google PageSpeed Insights — https://www.googleapis.com/pagespeedonline/v5/runPagespeed (Terms, Privacy Policy) — or GTmetrix — https://gtmetrix.com/api/2.0/tests (Terms, Privacy Policy). What is sent: The URL you are testing (your own page, which the provider then fetches publicly) and, if you supplied one, your own API key for that provider. No personal data, no visitor data, and no site content are sent by the plugin. How to turn it off: Switch “Enable external scores” off in the xSpeed Cache dashboard (Health → PageSpeed). Past results stay in your database until you clear them. Deactivation feedback (optional, only when you submit it) What it does: When you deactivate xSpeed Cache, a short optional survey asks why, so we can fix problems and prioritize the right features. Nothing is sent unless you pick a reason and click Submit & Deactivate. What is sent: the reason (or reasons) you selected and any note you type. If usage analytics (above) is enabled, that reason is attached to your regular analytics report. If usage analytics is disabled, only a minimal message is sent — the reason, your optional note, your site URL, the xSpeed Cache version, and your WordPress & PHP version — and nothing else (no plugin list, no theme data, no personal data, no page content). When it runs: Only on the deactivation screen, and only when you click Submit & Deactivate. Choosing Skip & Deactivate, closing the dialog, or pressing Esc sends nothing at all. Where the request goes: WP Insights, WPDeveloper’s service — https://send.wpinsight.com/process-plugin-data. (Privacy Policy) How to avoid it: Click Skip & Deactivate (or close the dialog) instead of Submit — deactivation works exactly the same, with no data sent. Third-party libraries This plugin bundles the following GPL-compatible third-party libraries: matthiasmullie/minify Used for CSS and JavaScript minification. Source: https://github.com/matthiasmullie/minify License: MIT matthiasmullie/path-converter Dependency of matthiasmullie/minify. Source: https://github.com/matthiasmullie/path-converter License: MIT React / React DOM / Scheduler Used for the xSpeed Cache admin interface bundle. Source: https://github.com/facebook/react License: MIT lucide-react Used for admin interface icons. Source: https://github.com/lucide-icons/lucide License: ISC