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

FlxWoo is a WooCommerce infrastructure plugin. It adds a REST API layer, server-side checkout rendering, and Stripe Checkout integration on top of standard WooCommerce — without replacing WooCommerce’s core order, payment, or inventory systems. It is designed for agencies and developers who need full control over checkout presentation while continuing to rely on WooCommerce for order management, tax calculation, coupon handling, and payment record-keeping. What FlxWoo Is A REST API layer for WooCommerce checkout state (namespace: flxwoo/v1) A server-side rendering layer for checkout and product page templates A Stripe Checkout integration with server-side session management and webhook handling A fallback-safe product page rendering layer: falls back to native WordPress/WooCommerce templates when the Render service is unavailable or the product type is not supported An admin dashboard for operational monitoring: Overview, Settings, and System Status pages An infrastructure layer that extends WooCommerce without replacing it What FlxWoo Is Not Not a WooCommerce fork or replacement Not a page builder or visual checkout designer Not a payment processor — payment remains in WooCommerce and Stripe Not a headless CMS Not a replacement for WooCommerce’s admin, order management, or product system Who FlxWoo Is For Agencies building custom checkout experiences on WooCommerce Developers who need REST access to WooCommerce checkout state Projects requiring server-side rendered checkout templates Teams integrating Stripe Checkout while keeping WooCommerce as the order system Architecture FlxWoo registers a REST namespace (flxwoo/v1). Checkout state endpoints (cart, order, coupon, customer) return JSON. Render endpoints (/render/checkout, /render/thank-you) return server-side rendered HTML. Product pages are intercepted at the template layer and rendered through the external Render service, with automatic fallback to native WordPress/WooCommerce templates if the service is unavailable or the product type is not supported. WooCommerce remains authoritative for all order, cart, tax, and payment data. FlxWoo reads and writes through WooCommerce’s standard APIs without modifying its data structures or core behavior. Features REST API under the flxwoo/v1 namespace Cart and checkout state endpoints returning JSON Stripe Checkout integration — server-side session creation and webhook handling Duplicate order prevention at the checkout session level Concurrent submission guard Session-independent Stripe return flow (order identity carried via URL, not session state) Server-side HTML rendering for checkout and thank-you templates Product page rendering via external Render service, with automatic fallback to native WordPress/WooCommerce templates Product type gate: only simple products (including virtual) are routed to the Render service; variable, external, and unrecognized types use native templates Structured logging for checkout and payment events Operational event store tracking webhook failures, Stripe connectivity issues, and auth denials Health endpoint at GET /wp-json/flxwoo/v1/health for uptime monitoring Admin Overview page with operational health summary and last-payment/last-webhook signals System Status page with diagnostics across environment, Stripe, cache, webhooks, checkout failures, and database Automated data retention: scheduled cleanup for idempotency records, Stripe events, checkout sessions, and operational events with defined retention windows Preserve-by-default uninstall policy: data is retained unless explicitly opted out in Settings Cache and CDN Configuration FlxWoo endpoints are session-sensitive and stateful. They must not be served from a cache layer under any circumstances. Why This Matters FlxWoo checkout endpoints read and write live session, cart, and payment state on every request. If a caching layer returns a stale or shared response, the result is incorrect behavior — not a gracefully degraded experience. Common symptoms include stale cart totals, duplicate checkout attempts, broken Stripe sessions, and session data surfacing to the wrong customer. Any FlxWoo endpoint returning a cache HIT response header is a production defect. What Must Bypass Cache Three route groups must bypass cache at every layer — page cache, CDN, reverse proxy, and any optimization plugin that operates on HTTP responses: /wp-json/flxwoo/* — all FlxWoo REST API endpoints (cart, checkout, payment, webhook, health) /checkout* — the WordPress checkout page and all trailing-slash or query-string variants /thank-you* — the order confirmation page and all variants FlxWoo emits Cache-Control: no-store headers via PHP on both the REST API and the HTML pages. However, CDN-level rules such as Cloudflare’s “Cache Everything” can override PHP headers at the edge before they reach the browser. PHP-level headers alone are not sufficient — explicit CDN bypass rules targeting these paths are required. Common Systems That Require Configuration WP Rocket — Add /wp-json/flxwoo/, /checkout, and /thank-you to “Never Cache URL(s)” in the Cache settings tab. WP Rocket uses substring prefix matching, so these entries cover /checkout* and /thank-you* including trailing-slash and query-string variants. LiteSpeed Cache — Add /wp-json/flxwoo/, /checkout, and /thank-you to the “Do Not Cache URIs” list under Cache > Excludes. LiteSpeed URI exclusions also use prefix matching, covering /checkout* and /thank-you*. Cloudflare — Use Cache Rules to bypass cache for paths matching /checkout*, /thank-you*, and /wp-json/flxwoo/*. If using Automatic Platform Optimization (APO), verify that checkout and thank-you URLs are in the APO exclusion list. Cloudflare’s “Cache Everything” page rule must not apply to these paths. Nginx / FastCGI — Add fastcgi_cache_bypass map entries for /wp-json/flxwoo/, /checkout*, and /thank-you* at the server or location block level. Varnish — Add pass conditions in vcl_recv for /wp-json/flxwoo/*, /checkout*, and /thank-you*. Aggressive optimization plugins — Verify that no plugin is buffering, combining, or caching REST API responses or HTML responses for FlxWoo routes or page wrappers. What Is Safe to Cache Static assets (CSS, JS, images), non-dynamic pages, and REST endpoints that explicitly return Cache-Control: public. FlxWoo’s own endpoints never set public cache headers. Full Configuration Reference Detailed per-system instructions, verification commands, and symptom diagnostics are in docs/cache-configuration.md. Requirements WordPress 6.0 or later PHP 8.0 or later WooCommerce (active; declared as a required plugin) Stripe account with Checkout enabled (for payment features) MySQL 5.7+ or MariaDB 10.3+ Operational Notes Health endpoint: GET /wp-json/flxwoo/v1/health always returns HTTP 200 when the plugin is active. Suitable for uptime monitoring and deployment verification. Logging: Structured logging for checkout and payment events. Useful for incident response and debugging in production environments. Database setup: Required tables are created automatically on activation. Schema migrations run silently on upgrade — no manual steps required. Data on uninstall: Data is preserved by default when the plugin is deleted. To remove all FlxWoo data, enable Delete all data on uninstall in FlxWoo Settings > Data before deleting the plugin. Idempotency: Checkout idempotency is database-backed, making the system safe for concurrent requests and browser retries. Stripe return flow: Order identity is carried via URL parameters after Stripe redirect, not session state. This makes the return path resilient to session loss between payment and confirmation. Security All REST endpoints enforce WordPress capability checks before processing requests. Input is validated and sanitized at the API boundary and within the service layer. All PHP files include an ABSPATH guard to prevent direct execution. Database queries use prepared statements throughout. PHP CodeSniffer with WordPress Coding Standards and security sniffs is enforced as a release gate. Limitations Requires WooCommerce to be active. FlxWoo will not initialize without it. Stripe integration requires an active Stripe account with Checkout enabled. Server-side rendering requires a live PHP execution environment. Fully static deployments are not supported. All FlxWoo REST endpoints must not be behind a full-page or CDN cache layer. Product page rendering via the Render service is currently limited to simple products (including virtual). Variable, external, and other product types fall back to native WordPress/WooCommerce templates.

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!