August 15, 2023  SEONews
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Modern Methods For Improving Drupal’s Largest Contentful Paint Core Web Vital — Smashing Magazine


When installing Drupal, you can choose a “demo” profile that showcases various functionalities. It’s a fun and safe way to try out various features. If you do that and test your site’s performance, you’re likely to find that the background image used in the hero component is slow to load. This is a very common problem with any component that uses a large image file as a background image. In this article, Mike Herchel walks you through how to tackle this common performance issue using modern techniques.

Let’s start with a fairly common example of a hero component on the homepage of Drupal’s demo installation of the Umami theme.

The image in this hero component is loaded by CSS via the background-image property. In order for the browser to display the image, it has a fairly long chain of dependencies:

  1. Download the HTML.
  2. Download and parse the CSS.
  3. Reconcile the CSS ruleset with the DOM.
  4. Download the image.
  5. Display the image.

While browsers are generally pretty fast, these steps still take time to load, typically in seconds, and even longer on slower, high-latency network connections. And because this image is within the initial viewport, it’s very noticeable.

So noticeable, in fact, that Core Web Vitals has a metric all about it called Largest Contentful Paint (LCP). This metric measures the time it takes, in seconds, to render the largest image or text block that is visible on the initial load. We can test for LCP in a number of ways. The following screenshot is...



source: https://news.oneseocompany.com/2023/08/15/modern-methods-for-improving-drupals-largest-contentful-paint-core-web-vital-smashing-magazine_2023081548957.html

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