Embed Optimizer vs W3 Total Cache

This plugin’s purpose is to optimize the performance of embeds in WordPress, such as Tweets, YouTube videos, TikToks, and others. The current optimizations include: Lazy loading embeds just before they come into view. Adding dns-prefetch links for embeds in the initial viewport. Reserving space for embeds that resize to reduce layout shifting. Lazy loading embeds improves performance because embeds are generally very resource-intensive, so lazy loading them ensures that they don’t compete with resources when the page is loading. Lazy loading of IFRAME-based embeds is handled simply by adding the loading=lazy attribute. Lazy loading embeds that include SCRIPT tags is handled by using an Intersection Observer to watch for when the embed’s FIGURE container is going to enter the viewport, and then it dynamically inserts the SCRIPT tag. This plugin also recommends that you install and activate the Optimization Detective plugin, which unlocks several optimizations beyond just lazy loading. Without Optimization Detective, lazy loading can actually degrade performance when an embed is positioned in the initial viewport. This is because lazy loading such viewport-initial elements can degrade LCP since rendering is delayed by the logic to determine whether the element is visible. This is why WordPress Core tries its best to avoid lazy loading IMG tags which appear in the initial viewport, although the server-side heuristics aren’t perfect. This is where Optimization Detective comes in since it detects whether an embed appears in any breakpoint-specific viewports, like mobile, tablet, and desktop. (See also the Image Prioritizer plugin which extends Optimization Detective to ensure lazy loading is correctly applied based on whether an IMG is in the initial viewport.) When Optimization Detective is active, it will start keeping track of which embeds appear in the initial viewport based on actual visits to your site. With this information in hand, Embed Optimizer will then avoid lazy loading embeds which appear in the initial viewport. Furthermore, for such above-the-fold embeds Embed Optimizer will also add dns-prefetch links for resources known to be used by those embeds. For example, if a YouTube embed appears in the initial viewport, Embed Optimizer with Optimization Detective will omit loading=lazy while also adding a dns-prefetch link for https://i.ytimg.com which is the domain from which YouTube video poster images are served. Such links cause the initial-viewport embeds to load even faster. The other major feature in Embed Optimizer enabled by Optimization Detective is the reduction of layout shifts caused by embeds that resize when they load. This is seen commonly in WordPress post embeds or Tweet embeds. Embed Optimizer keeps track of the resized heights of these embeds. With these resized heights stored, Embed Optimizer sets the appropriate height on the container FIGURE element as the viewport-specific min-height so that when the embed loads it does not cause a layout shift. Since Optimization Detective relies on page visits to learn how the page is laid out, you’ll need to wait until you have visits from a mobile and desktop device to start seeing optimizations applied. Also, note that Optimization Detective does not apply optimizations by default for logged-in admin users. Please note that the optimizations are intended to apply to Embed blocks. So if you do not see optimizations applied, make sure that your embeds are not inside a Classic Block. Your site must have the REST API accessible to unauthenticated frontend visitors since this is how metrics are collected about how a page should be optimized. There are currently no settings and no user interface for this plugin since it is designed to work without any configuration.

W3 Total Cache (W3TC) improves the SEO, Core Web Vitals and overall user experience of your site by increasing website performance and reducing load times by leveraging features like content delivery network (CDN) integration and the latest best practices. W3TC is the only web host agnostic Web Performance Optimization (WPO) framework for WordPress trusted by millions of publishers, web developers, and web hosts worldwide for more than a decade. It is the total performance solution for optimizing WordPress Websites. BENEFITS Improvements in search engine result page rankings, especially for mobile-friendly websites and sites that use SSL At least 10x improvement in overall site performance (Grade A in WebPagetest or significant Google PageSpeed improvements) when fully configured Improved conversion rates and “site performance” which affect your site’s rank on Google.com “Instant” repeat page views: browser caching Optimized progressive render: pages start rendering quickly and can be interacted with more quickly Reduced page load time: increased visitor time on site; visitors view more pages Improved web server performance; sustain high traffic periods Up to 80% bandwidth savings when you minify HTML, minify CSS and minify JS files. KEY FEATURES Compatible with shared hosting, virtual private / dedicated servers and dedicated servers / clusters Transparent content delivery network (CDN) management with Media Library, theme files and WordPress itself Mobile support: respective caching of pages by referrer or groups of user agents including theme switching for groups of referrers or user agents Accelerated Mobile Pages (AMP) support Secure Socket Layer (SSL/TLS) support Caching of (minified and compressed) pages and posts in memory or on disk or on (FSD) CDN (by user agent group) Caching of (minified and compressed) CSS and JavaScript in memory, on disk or on CDN Caching of feeds (site, categories, tags, comments, search results) in memory or on disk or on CDN Caching of search results pages (i.e., URIs with query string variables) in memory or on disk Caching of database objects in memory or on disk Caching of objects in memory or on disk Caching of fragments in memory or on disk Caching methods include local Disk, Redis, Memcached, APC, APCu, eAccelerator, XCache, and WinCache Minify CSS, Minify JavaScript and Minify HTML with granular control Minification of posts and pages and RSS feeds Minification of inline, embedded or 3rd party JavaScript with automated updates to assets Minification of inline, embedded or 3rd party CSS with automated updates to assets Defer non-critical CSS and JavaScript for rendering pages faster than ever before Defer offscreen images using Lazy Load to improve the user experience Browser caching using cache-control, future expire headers and entity tags (ETag) with “cache-busting” JavaScript grouping by template (home page, post page etc) with embed location control Non-blocking JavaScript embedding Import post attachments directly into the Media Library (and CDN) Leverage our multiple CDN integrations to optimize images WP-CLI support for cache purging, query string updating and more Various security features to help ensure website safety Caching statistics for performance insights of any enabled feature Extension framework for customization or extensibility for Cloudflare, WPML and much more Reverse proxy integration via Nginx or Varnish Image Converter extension provides modern image format conversion (e.g., WebP, AVIF) from common image formats (on upload and on demand) W3 Total Cache Pro Features With over a million active installs, W3 Total Cache is the most comprehensive WordPress caching plugin available and has robust premium features that help deliver an exceptional user experience. Full Site Delivery: Serve your entire site from a Content Delivery Network (CDN), ensuring faster load times worldwide. Fragment Cache: Optimize the caching of dynamic content while still improving performance. REST API Caching: Speed up your headless WordPress site by caching REST API calls. Eliminate Render-Blocking CSS: Ensure your CSS doesn’t hold up page loading, providing faster initial paint. Delay Scripts: Improve performance by delaying the loading of non-essential scripts until they are needed. Preload Requests: Boost page performance by preloading critical resources before they’re requested. Remove CSS/JS: Clean up unnecessary CSS and JavaScript files that slow down your pages. Lazy Load Google Maps: Load Google Maps only when it’s visible, reducing unnecessary requests. WPML Extension: Optimize performance on multilingual sites powered by WPML. Caching Statistics: Get detailed insights on cache usage and performance improvements. Purge Logs: Keep your site clean by automatically purging unnecessary cache logs. 30-Day Money-Back Guarantee Try W3 Total Cache Pro risk-free with our 30-day money-back guarantee. If you’re not satisfied, we will refund your purchase. PAGESPEED SCORE IMPROVEMENTS To help you understand the impact of individual features on your website’s performance, we’ve tested each feature separately to see its effect on Google PageSpeed scores. While optimal results come from configuring several different caching tools together, the following individual features also show significant improvements on their own: Remove Unused CSS/JS This feature removes CSS and JavaScript files that are not needed for the current page, reducing the load time. Added over 27 points to the Google PageSpeed score (Before: 57.2 / After: 86.7) Reduced the Potential Savings From Unused JavaScript from 127.5 KiB to 84 KiB View the test results Full Site Delivery Full Site Delivery optimizes the delivery of your entire site, enhancing the server response time. Added a 99% performance enhancement to the Average Server Response Time (Before: 3413 ms / After: 34 ms) View the test results Eliminate Render Blocking CSS This feature eliminates CSS that blocks the rendering of your page, speeding up the initial load time. Added over 17 points to the Google PageSpeed score (Before: 53.75 / After: 71) Reduced the Potential Savings From Render-Blocking Resources by over 94% (Before: 2432.5 ms / After: 125 ms) Improved the Largest Contentful Paint time by over 56% (Before: 7s / After: 3.04s) View the test results Delay Scripts Delay Scripts postpones the loading of certain scripts until they are needed, reducing initial load times. Added 14 points to the Google PageSpeed Performance score (Before: 54.25 / After: 68.5) Reduced the Time Third-Party Code Blocked The Main Thread For by 62% (Before: 825 ms / After: 197.5 ms) View the test results Rest API Caching This feature caches API responses, reducing server load and speeding up API interactions. Reduced the Average Server Load by 40% (Before: 0.62 / After: 0.37) Sped up API Responses by 84.5% (Before: 968ms / After: 150ms) Reduced the Average Server Load by 24% under during a major traffic spike (Before: 34.55 / After: 26.19) View the test results Modern Image Formats Converts images to modern formats like WebP or AVIF, which are more efficient and faster to load. Added over 9 points to the Google PageSpeed score (Before: 84.67 / After: 93.83) View the test results Lazy Load Google Maps Delays the loading of Google Maps until the user interacts with them, reducing initial load time. Added 10 points to the Google PageSpeed score (Before: 66 / After: 76) Reduced the Total Blocking Time Performance score by 72% (Before: 287.5 ms / After: 80 ms) View the test results Speed up your site tremendously, improve core web vitals and the overall user experience for your visitors without having to change your WordPress host, theme, plugins or your content production workflow. What users have to say: Read testimonials from W3TC users. Who do I thank for all of this? It’s quite difficult to recall all of the innovators that have shared their thoughts, code and experiences in the blogosphere over the years, but here are some names to get you started: Steve Souders Steve Clay Ryan Grove Nicholas Zakas Ryan Dean Andrei Zmievski George Schlossnagle Daniel Cowgill Rasmus Lerdorf Gopal Vijayaraghavan Bart Vanbraban mOo [villu164] (https://www.wordfence.com/threat-intel/vulnerabilities/researchers/villu164) Please reach out to all of these people and support their projects if you’re so inclined.