Largest Contentful Paint (LCP) is a measurement of how long the largest element on the page takes to render. It’s one of several Web Vital metrics that measure how real users perceive the performance of modern web applications. New measurements like Largest Contentful Paint are increasingly important as JavaScript and SPA’s render more content after page load is completed.

Cumulative Layout Shift (CLS), sometimes known as jank, is a measurement of how much elements move due to late-rendered content. You can think of it as a measurement of layout instability. It has become a common problem for many websites due to third-party scripts and tag management and its one of the new Core Web Vital metrics.

How is Google so fast? It’s so fast we take it for granted. It feels instant from the time you search to when results are displayed. What can we learn about the techniques they use to make their site so fast?

This is the complete guide to the metrics, methods, and measurements of web performance in 2023. If you run a website, this guide has all the fundamental ideas you need to understand to build a fast website for your users, and for search engines.

Whether you’re an e-commerce company, a SaaS provider, or a content publisher, understanding the performance of your website is important to everyone on the team—not just the developers. Performance is a huge part of the user experience and directly tied to how well your website achieves its goals. But web performance is often measured in very technical terms, like Largest Contentful Paint, that cause most business folk’s eyes to glaze over.

Implementing Google Ads can be complicated. If done incorrectly, it negatively impacts your website’s performance. Fortunately, there is a new Google Lighthouse plugin tailored specifically to find problems with your Google ad implementation.

Charting can be complicated and intimidating, especially when dealing with web performance data, flame charts, and percentiles. There is so much data crammed together! Why are the numbers all different?! Let’s break down these charts, what they are good for, and when to use them.

Google has a well earned reputation for speed. At least on their own sites. It’s an entirely different story when it comes to their ad network. Google ads are slowing down thousands of sites across the internet.