Why Core Web Vitals Are Just the Beginning

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Beyond the Metrics

While Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS) are critical indicators of user experience, they don't tell the whole story. True performance optimization requires looking beyond these numbers and understanding the qualitative aspects of user interaction.

"Performance is not just about speed; it's about how the user perceives that speed. A fast site that feels clunky is still a bad experience."

Practical Steps

Here are a few things to consider:

• Responsiveness to Interactions: How quickly does the UI respond to clicks, taps, and scrolls after the initial load?
• Animation Smoothness: Are animations and transitions fluid, or do they jank and stutter?
• Resource Loading Strategy: Are you prioritizing critical assets and deferring non-essential ones effectively?

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The Role of Custom Metrics

To truly understand user-perceived performance, you often need to go beyond the standard metrics and define your own. These are known as custom metrics. For example, on a social media site, you might measure the time it takes for the main feed to become interactive. On an e-commerce site, it could be the time until the "Add to Cart" button is clickable on a product page.

Defining What Matters

Creating effective custom metrics involves a few key steps:

• Identify Key User Journeys: What are the most critical paths users take on your site?
• Pinpoint Critical Elements: Within those journeys, which UI elements are most important for the user to complete their task?
• Instrument and Measure: Use APIs like the User Timing API to mark these moments in your code and send the data to your analytics or RUM tool.

By focusing on what actually matters to your users, you can create a performance story that resonates with both developers and business stakeholders alike.

Performance as a Feature

Ultimately, it's essential to treat performance not as a one-off task, but as a core feature of your product. This means integrating it into your entire development lifecycle, from initial design to final deployment and ongoing monitoring.

When performance is a feature, it gets the attention it deserves. It becomes a shared responsibility, and the entire team is empowered to build experiences that are not only functional and beautiful, but also incredibly fast and delightful to use. This cultural shift is the real key to unlocking the full potential of the web.

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