If too many images are loaded at once, it will not only slow down the page speed, but also waste bandwidth. Implementing Lazy Load on WordPress can effectively improve website performance, especially for sites with more pictures.
What is lazy image loading?
Lazy loading is an optimization technique, which refers to the loading of pictures in the corresponding area when the user scrolls to a certain position on the page. This can reduce the amount of data initially loaded by the web page, speed up the loading speed of the first screen, and improve user experience and page ratings.
WordPress has already supported native lazy loading attributes (loading="lazy") by default for <img src="/static/imghw/default1.png" data-src="image.jpg" class="lazy" alt="How to lazy load images in WordPress" >
tags after version 5.5, but this alone is not comprehensive enough, especially for old browsers or complex layouts.
Use plugins to achieve lazy loading (recommended)
For most ordinary users, using plugins is the easiest and most reliable way. There are many excellent WordPress plug-ins that can help you enable lazy loading function with one click.
Recommended plugins:
- Smush
- Lazy Load by WP Rocket
- a3 Lazy Load
These plugins will usually automatically add loading="lazy"
attribute to the image and provide a fallback mechanism to be compatible with older browsers.
? Suggestions for use:
- It can be enabled after installation, and most plug-ins come with default settings.
- You can customize the delayed loading object, such as whether it contains avatar, sidebar pictures, etc.
- Some plugins also support lazy loading of videos and iframes.
Manually add native lazy loading (suitable for those who know some code)
If you don't want to use plugins, you can also use HTML native lazy loading properties directly in your code:
<img src="/static/imghw/default1.png" data-src="image.jpg" class="lazy" loading="lazy" alt="descriptive text">
WordPress will automatically add loading="lazy"
to the pictures inserted in the media library by default, but some themes or custom blocks may not be added automatically.
? Notes:
- Native lazy loading currently does not support Safari browser (IOS 15 already supported)
- Not suitable for background images, additional processing is required
- For key images (such as large picture on the home screen), it is recommended not to add lazy to avoid blank flickering
Additional optimization: match placeholders and preloads
For a better experience, you can add a fuzzy small image as a placeholder when lazy loading, or load the picture that is about to enter the viewport in advance.
Common practices include:
- Use the "fuzzy placeholder" function that comes with the plug-in
- Add fade-in animation effects to make loading more natural
- Set preload boundary to load the pictures you are about to see in advance
This type of optimization generally requires support from JS scripts or advanced lazy loading plug-ins, such as A3 Lazy Load or Flying Images .
Basically these are the methods. Lazy loading itself is not complicated, but it is easy to ignore details, such as compatibility, special image processing, etc. You can start with the plug-in first, then adjust the details as needed and gradually optimize.
The above is the detailed content of How to lazy load images in WordPress. For more information, please follow other related articles on the PHP Chinese website!

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