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Web Performance Guide

Business Success
Core Web Vitals
Optimization Techniques
Metrics & Charts

New to the world of web performance? Welcome! Here's everything you need to know to master website monitoring, analytics, and diagnostics. Learn how to deliver a fast, joyous experience to all your users.

Business Success

Making your pages faster isn't just for the web performance geeks in your organization. Site speed affects every business metric you care about – from bounce rate to conversions to search rank. This section gives you the data, tools, and tips to make everyone in your company care about how page speed affects your users and build a healthy culture of web performance..

Core Web Vitals

There are a lot of metrics you need to track, and Core Web Vitals are among them. These three metrics – Largest Contentful Paint, Cumulative Layout Shift, and Interaction to Next Paint – are important ingredients in Google's search ranking algorithm. We'll cover what they measure, how to track them over time (and get alerts when they degrade), and how to optimize your pages to improve them.

Optimization Techniques

Website speed testing is just the first step toward optimizing your pages to make them faster – and make your users happier. This section covers best practices for creating performance budgets to fight regressions, as well as techniques for optimizing images, JavaScript, CSS, SPAs, third-party scripts, and more!

Metrics and Charts

There's a lot of terminology and TLAs (three-letter acronyms) in the web performance space. No fear! We're here to explain everything in plain language so you can understand what you're seeing in your site speed testing tools.

Everything in this guide was written by actual humans!

Meet our amazing team of web performance experts and authors:

  • Cliff Crocker
  • Andy Davies
  • Tammy Everts
  • Tim Kadlec
  • Steve Souders
  • Joseph Wynn
  • Mark Zeman

Not only do they deliver world-class consulting and hands-on care to our wonderful customers, they're pretty great writers, too!

Questions? We're happy to help! Drop us a note at