- October 21, 2023
- Core Web Vitals
Do you want to improve the performance of your website by deferring offscreen images? Lazy loading and core web vitals are two powerful tools. Learn how they work together to enhance performance and provide a better user experience. Discover the benefits of lazy loading and how to implement it on your website.
- Lazy loading is a performance optimisation technique that defers the loading of offscreen images.
- It reduces the amount of data transferred by only loading the visible images.
- Lazy loading dramatically improves page loading times and enhances the overall user experience.
- By combining lazy loading with Core Web Vitals, offscreen images are deferred until the user scrolls to them, reducing data load and improving page speed.
What Is Lazy Loading
You’ve probably heard of lazy loading – it’s a performance optimisation technique that defers the loading of offscreen images. The goal is to improve the loading time of a webpage by only loading the images that are visible to the user. In other words, instead of loading all of the images on a page at once, only the images that the user can see are loaded. This way, the browser can render the page faster, reducing loading time and increasing the overall performance of the website.
Additionally, lazy loading can also reduce the amount of data transferred, as the browser only needs to load the visible images instead of all of them at once. This can help reduce bandwidth usage, resulting in cost savings. Furthermore, it can also help improve the user experience, as the page will load faster and visitors won’t have to wait as long for images to appear.
In short, lazy loading is a great way to improve the performance of a website. It can reduce loading time, reduce data transfer, and improve the user experience. It’s an essential tool for web developers looking to optimise their sites for the best possible performance.
How Does Lazy Loading Work
Building on the performance optimisation technique of lazy loading, let’s take a look at how it actually works. Lazy loading defers offscreen images to improve webpage loading time. It works by only loading images that are in the viewport or close to it. This way, the webpage doesn’t need to waste resources loading images that are far away and not visible to the user.
Here’s how it works:
- When a user visits a web page:
- The browser requests the HTML document, which includes references to the offscreen images
- The browser parses the HTML and loads the visible images
- The browser then checks if any of the offscreen images are close to viewport
- If an offscreen image is close to viewport:
- The browser requests the offscreen image
- The offscreen image is then loaded
- If an offscreen image is far away from viewport:
- The browser does not request the offscreen image
- The offscreen image is not loaded
Benefits of Lazy Loading
It can be beneficial to use lazy loading to defer offscreen images and enhance performance, especially when it comes to Core Web Vitals. By utilising lazy loading, websites can dramatically improve their page loading times, as well as the overall user experience. With lazy loading, only images that are within the visible area of the browser window are loaded initially, while the offscreen images are deferred until the user scrolls down the page. This reduces the amount of data that needs to be loaded, resulting in faster loading times and improved performance.
Lazy loading also helps to improve the Core Web Vitals, which are metrics that measure the user experience of a website. By deferring offscreen images, the time to first meaningful paint is decreased, which is an important factor in the Core Web Vitals. Additionally, it helps to reduce the total page weight, which is another metric used to measure web performance.
Lazy loading can also help to save the user’s data plan. By deferring offscreen images, the user’s device does not need to download as much data, resulting in less of their data plan being used up. This is especially important for users who have limited data plans or are browsing on a mobile device.
What Are Core Web Vitals
Understanding Core Web Vitals is essential for optimising website performance, so let’s take a look at what they are. Core Web Vitals are essential metrics used to measure the performance of web pages and user experience. They include:
- Loading performance:
- First Contentful Paint (FCP): measures the time it takes for a page’s content to appear on the user’s screen.
- Largest Contentful Paint (LCP): measures the time it takes for the main content of the page to appear on the user’s screen.
- First Input Delay (FID): measures the time it takes for a page to become interactive after the user takes an action.
How Do Core Web Vitals and Lazy Loading Work Together
By combining lazy loading with Core Web Vitals, you can defer offscreen images and boost performance. Lazy loading is a technique that delays loading of images until they are visible on the user’s screen. This can help reduce the amount of data required to load a page, which can lead to improved page loading times. Core Web Vitals are a set of page loading metrics that measure the speed, responsiveness, and visual stability of a website. Together, Core Web Vitals and lazy loading can work together to provide an optimal user experience.
When lazy loading is combined with Core Web Vitals, images that are offscreen are not loaded until the user scrolls to them. This helps to reduce the amount of data that needs to be loaded and improves the speed of the page. It also helps to reduce the amount of time it takes for the page to become visually stable, as it reduces the need to recalculate the layout due to images loading. In addition, it can help to reduce the amount of time it takes for the page to become interactive, as fewer images need to be loaded.
Implementing Lazy Loading
Implementing lazy loading is easy with the help of a few tools. Lazy loading is a web performance technique that defers the loading of offscreen images until the user scrolls down and they appear on the screen. This improves the overall page loading speed, user experience, and Core Web Vitals Scores. Here are a few ways to implement lazy loading:
- Native Lazy Loading:
- The latest versions of Chrome, Firefox, and Safari have native lazy loading support built-in. This allows web developers to simply add the loading=”lazy” attribute to the <img> element to enable lazy loading.
In addition, you can also set up lazy loading for videos, iframes, and other content types. This ensures that users only have to download the content they need and the page only loads the content when the user scrolls to it. Implementing lazy loading is a great way to improve page performance and Core Web Vitals Scores.
You’ve seen how lazy loading and Core Web Vitals work together to help improve your site performance. You don’t need to be a tech whiz to implement lazy loading, either. All you need is the right tools and a bit of knowledge. So why not give it a shot? You’ll be surprised at the difference it makes when it comes to enhancing your site’s performance.
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