Posts tagged with
" javascript"

New LUX JavaScript Dashboards

As organizations work to improve performance for users around the world on slower networks and devices, the focus on JavaScript continues to grow. LUX's new JavaScript dashboards help to identify the problems and solutions for creating a fast, joyous user experience.

LUX is SpeedCurve's real user monitoring product. We launched it two years ago with four dashboards: Live, Users, Performance, and Design. Today we've added two more LUX dashboards: JavaScript and JS Errors. These new dashboards let you see the impact JavaScript has on your site and on your users with new metrics, including First CPU Idle and First Input Delay, and new features, such as correlation charts that show you how CPU time correlates with bounce rate.

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Preload scripts

In my previous post I talked about how loading scripts asynchronously reduces the impact of JavaScript resulting in a (much) faster user experience. But even when scripts are loaded async, the browser may still twiddle its thumbs for a second or more waiting for the first script to arrive. This delay can be decreased by using link rel=preload like this:

<link rel="preload" href="main.js" as="script">

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Metrics from 1M sites

The number of performance metrics is large and increases every year. It's important to understand what the different metrics represent and pick metrics that are important for your site. Our Evaluating rendering metrics post was a popular (and fun) way to compare and choose rendering metrics. Recently I created this timeline of performance metric medians from the HTTP Archive for the world's top ~1.3 million sites:

Desktop metric timeline

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First Input Delay shows how quickly your site responds to user interaction

We're excited to announce the availability of the First Input Delay metric as part of LUX, SpeedCurve's RUM product.

First Input Delay

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