Above The Fold Optimization

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This plugin is a toolkit for Above The Fold Optimization that enables to achieve a Google PageSpeed 100 Score. This plugin is compatible with most optimization, minification and full page cache plugins and can be made compatible with other plugins by creating a module extension. Some of the supported plugins include: * Autoptimize * W3 Total Cache * WP Super Cache * WP Fastest Cache * Cache Enabler (KeyCDN.com) * Better WordPress Minify * WP Super Minify * Click here for a list with supported plugins. Warning: This plugin is not a simple ‘on/off’ plugin. It is a tool for optimization professionals and advanced WordPress users to achieve a Google PageSpeed 100 Score. Critical CSS Tools The plugin contains tools to manage Critical Path CSS. Some of the features: Conditional Critical CSS (apply tailored Critical CSS to specific pages based on WordPress conditions and filters) Management via text editor and FTP (critical CSS files are stored in the theme directory) Full CSS Extraction: selectively export CSS files of a page as a single file or as raw text for use in critical CSS generators. Quality Test: test the quality of Critical CSS by comparing it side-by-side with the full CSS display of a page. This tool can be used to detect a flash of unstyled content (FOUC). Read more about Critical CSS in the documentation by Google. This article by a Google engineer provides information about the available methods for creating critical CSS. CSS Load Optimization The plugin contains tools to optimize the delivery of CSS in the browser. Some of the features: Async loading via loadCSS (enhanced with requestAnimationFrame API following the recommendations by Google) Remove CSS files from the HTML source. Capture and proxy (script injected) external stylesheets to load the files locally or via a CDN with optimized cache headers. This feature enables to pass the “Leverage browser caching” rule from Google PageSpeed Insights. The plugin does not provide CSS code optimization, minification or concatenation. Javascript Load Optimization The plugin contains tools to optimize the loading of javascript. Some of the features: Robust async script loader based on little-loader by Walmart Labs (reference) HTML5 Web Worker and Fetch API based script loader with localStorage cache and fallback to little-loader for old browsers. jQuery Stub that enables async loading of jQuery. Abiding of WordPress dependency configuration while loading files asynchronously. Lazy Loading Javascript (e.g. Facebook or Twitter widgets) based on jQuery Lazy Load XT. Capture and proxy (script injected) external javascript files to load the files locally or via a CDN with optimized cache headers. This feature enables to pass the “Leverage browser caching” rule from Google PageSpeed Insights. The HTML5 script loader offers the following advantages when configured correctly: 0 javascript file download during navigation 0 javascript file download for returning visitors (e.g. from Google search results, leading to a reduced bounce rate) faster script loading than browser cache, especially on mobile (according to a proof of concept by a Google engineer) The plugin does not provide Javascript code optimization, minification or concatenation. Google PWA Optimization The plugin contains tools to achieve a 100 / 100 / 100 / 100 score in the Google Lighthouse Test. Google has been promoting Progressive Web Apps (PWA) as the future of the internet: a combination of the flexability and openness of the existing web with the user experience advantages of native mobile apps. In essence: a mobile app that can be indexed by Google and that can be managed by WordPress. This plugin provides an advanced HTML5 Service Worker based solution to create a PWA with any website. Some of the features: JSON based request and cache policy that includes regular expressions and numeric operator comparison for request and response headers. Offline availability management: default offline page, image or resource. Prefetch/preload resources in the Service Worker for fast access and/or offline availability. Event/click based offline cache (e.g. “click to read this page offline”) HTTP HEAD based cache updates. Option to add offline class on <body> when the connection is offline. Web App Manifest management: add website to home screen on mobile devices, track app launches and more. Google Web Font Optimization The plugin contains tools to optimize Google Web Fonts. Some of the features: Load Google Web Fonts via Google Web Font Loader. Auto-discovery of Google Web Fonts using: Parse <link rel="stylesheet"> in HTML source. Parse @import links in minified CSS from minification plugins (e.g. Autoptimize). Parse existing WebFontConfig javascript configuration. Remove fonts to enable local font loading. Upload Google Web Font Packages from google-webfonts-helper to the theme directory. Gulp.js Critical CSS Creator The plugin contains a tool to create Critical CSS based on Gulp.js tasks. The tool is based on critical (by a Google engineer).