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In Defence of DOM­Content­Loaded

CSS Wizardry

And luckily, while DOMContentLoaded is now considered a legacy metric, we can still get field data for it from two pretty decent sources… Chrome User Experience Report (CrUX) Things got a lot worse between March and April 2023 CrUX Dashboard is one of very few CrUX resources that surfaces the DOMContentLoaded event to us.

Metrics 326
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Understanding the performance impact of anti-flicker snippets

Speed Curve

Experimentation tools that use asynchronous scripts – such as Google Optimize, Adobe Target, and Visual Web Optimizer – recommend using an anti-flicker snippet to hide the page until they've finished executing. Google Optimize) has finished applying its experiments. In Google Optimize's default case is the whole document.

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Debugging Interaction to Next Paint (INP)

Speed Curve

In this post I'm going to walk through: How I help people identify the causes of poor INP times Examples of some of the most common issues Approaches I've used to help sites improve their INP Identifying Interactions The Chrome UX Report (CrUX) can provide a high-level view of INP. Opening a guest profile in Chrome 2.

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Google Lighthouse Audits – How to use Chrome’s built-in speed testing tool

MachMetrics

If you’re not a developer/designer, you may not be familiar with the Chrome DevTools and the extremely powerful Google Lighthouse Audits that can be found inside. However, you have likely used the Web UI that Google uses to allow you to test websites for speed – Google PageSpeed Insights. Performance.

Google 82
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Chrome DevTools - 20+ Tips and Tricks

KeyCDN

Google Chrome is currently one of the most popular web browsers used by developers today. According to StatCounter , as of September 2019, Google Chrome holds 63.72% browser market share across the globe. What Are the Google Chrome DevTools? Go to More Tools and then click Developer Tools.

Google 85
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A Complete Guide to Performance Budgets

Speed Curve

seconds or less, which is Google's recommendation for page experience and SEO. Your site has a number of people contributing content, such as unoptimized images and third-party tags that have the potential to seriously hurt the speed of your pages. Let's continue with the example above, where the worst LCP time was 8.64

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Don’t Sink Your Website With Third Parties

Smashing Magazine

The most popular, by far, is the Google Lighthouse report (available in Chrome Developer Tools) and Google’s Page Speed Insights. Configuring WebPageTest to run a test measurement that simulates a failure of the Google Fonts third-party service. Are you using one (or more than one) tag manager? Large preview ).

Website 131