PageSpeed Insights Library
State of the art technology for security, speed and backups. Perfect for serious business owners!
Avoid an excessive DOM size
What is the avoid excessive-DOM size warning in lighthouse, PageInsights etc? Lighthouse flags pages that have either: more than 1,500 DOM nodes in total.This means that there…
Avoid enormous network payloads
How to avoid enormous network payloads? The optimizations below should be an integral part of your development workflo, ensuring you are providing a fast-loading page…
Avoid large layout shifts
How do Layout Shifts affect page performance? When a user visits your webpage, they’re usually looking to quickly interact with buttons, contact forms, images and…
Defer offscreen images
Overview Deferring offscreen images (or lazy-loading) refers to the practice of delaying the loading of images that aren’t in your visitors’ viewport until they are…
Does not use passive listeners to improve scrolling performance
Overview Browsers like Chrome normally block page scrolling during the initial page load until JavaScript has executed. With JavaScript already blocking the main-thread, smooth scrolling is…
Efficiently encode images
Overview Images and videos likely account for the bulk of your total page size compared to HTML, CSS, or JavaScript files. If these images are…
Eliminate render-blocking resources
Overview Render-blocking resources are scripts, stylesheets, and HTML imports that block or delay the browser from rendering page content to the screen. These resources delay…
Enable text compression
Lighthouse: Enable text compression Overview Enabling text compression allows you to serve smaller text-based resources like HTML, CSS, and JavaScript in the interest of faster…
Image elements do not have explicit width and height
Overview Images and/or videos that do not have explicit width and height attributes can cause large layout shifts as your page loads. Layout shifts can be frustrating to your page visitors…
Improve Cumulative Layout Shift
Overview Cumulative Layout Shift (CLS) is a performance metric used to measure the perceived page load visual stability or the unexpected shifting of web elements while loading…
Improve Speed Index
Overview Speed Index (SI) is a metric that measures how fast your page is visually complete above-the-fold (what you can see without scrolling). SI is…
Improve Time to Interactive
Overview Time to Interactive (TTI) is a metric that measures a page’s load responsiveness and identifies situations where a page looks interactive but actually isn’t. TTI…
Improve Total Blocking Time
Total Blocking Time (TBT) is a new Lighthouse Performance metric that quantifies your page’s load responsiveness to user input. It measures the total amount of…
Largest Contentful Paint element
Overview Largest Contentful Paint (LCP) is a performance metric that measures the perceived loading experience for users. Simply, LCP measures how long it takes for…
Minify CSS
Overview Minifying CSS files can help reduce their file sizes by removing comments, white spaces, and redundant code. The smaller the CSS files are, the faster they are downloaded…
Minify JavaScript
Overview Minifying JavaScript files is an optimization technique to reduce JavaScript payload and the main-thread blocking time. Minification can help reduce JavaScript file sizes by removing comments, white…
Minimize main-thread work
Overview ‘Minimizing main-thread work’ is a high impact audit within the context of your site performance. The main-thread handles most of the processes involved in loading your…
Preload Largest Contentful Paint image
Preloading the Largest Contentful Paint (LCP) image can display your hero image much earlier in the page load. A fast LCP enables your page visitors…
Reduce initial server response time
Time to First Byte (TTFB), also known as server response time, is the time it takes for the browser to receive the first byte in response…
Reduce JavaScript execution time
Overview Reducing JavaScript execution time, in general, refers to decreasing the amount of time spent parsing, compiling, and executing JavaScript files. By default, JavaScript executes on the main-thread and when this…
Reduce the impact of third-party code
Overview Third-party code consists of analytics services, advertisements and other elements that are served from an external domain URL. These resources are often responsible for…
Serve images in next-gen formats
Overview Most websites serve images in JPEG or PNG formats, these formats have been around for over 20 years! The availability of a new generation…
Serve static assets with an efficient cache policy
Overview Serving static assets with an efficient cache policy helps improve page load times on repeat visits by storing these files locally in the user’s…
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