Description

Lazy Load displays images and/or iframes on a page only when they are visible to the user. This reduces the number of HTTP requests mechanism and improves the loading time.

You can lazy load thumbnails, all images in a post content or in a widget text, avatars, smilies and iframes. No JavaScript library such as jQuery is used and the script weight is less than 10KB.

You can also replace Youtube iframes by a preview thumbnail to further speed up the loading time of your website.

Turn on lazy load to optimize your images and make your website faster!

Dependencies

Lazy load script: https://github.com/verlok/lazyload

Related Plugins

Imagify: Best Image Optimizer to speed up your website with lighter images.
WP Rocket: Best caching plugin to speed-up your WordPress website.
Heartbeat Control by WP Rocket: Heartbeat Control by WP Rocket: Best plugin to control the WordPress Heartbeat API and reduce CPU usage.

Installation

Upload the complete rocket-lazy-load folder to the /wp-content/plugins/ directory
Activate the plugin through the ‘Plugins’ menu in WordPress

FAQ

How can I use native lazyload?

To use native lazyload on browsers supporting this feature, you need to use the following line:

add_filter( 'rocket_use_native_lazyload', '__return_true' );

Browsers that do not support native lazyload will use the JS-based solution as before.

How can I deactivate Lazy Load on some pages?

You can use the do_rocket_lazyload filter.

Here is an example to put in functions.php files that disable lazyload on posts:

add_action( 'wp', 'deactivate_rocket_lazyload_on_single' );
function deactivate_rocket_lazyload_on_single() {
    if ( is_single() ) {
        add_filter( 'do_rocket_lazyload', '__return_false' );
    }
}

How can I deactivate Lazy Load on some images?

Simply add a data-no-lazy="1" property in you img or iframe tag.

You can also use the filters rocket_lazyload_excluded_attributes or rocket_lazyload_excluded_src to exclude specific patterns.

For iframes, the filter is rocket_lazyload_iframe_excluded_patterns.

How can I change the threshold to trigger the load?

You can use the rocket_lazyload_threshold filter.

Code sample:

function rocket_lazyload_custom_threshold( $threshold ) {
    return 100;
}
add_filter( 'rocket_lazyload_threshold', 'rocket_lazyload_custom_threshold' );

I use plugin X and my images don’t show anymore

Some plugins are not compatible without lazy loading. Please open a support thread, and we will see how we can solve the issue by excluding lazy loading for this plugin.

How can I lazy load a background-image?

The plugin will automatically lazy load background-images set with a style attribute to a div element:

<div style="background-image: url(image.jpg);">

You can also apply it manually. The element you want to apply lazy load on must have this specific markup:

<div class="rocket-lazyload" data-bg="url(../img/image.jpg)"></div>

The element must have the class rocket-lazyload, and a data-bg attribute, which value is the CSS url for the image.

Reviews

yosefy September 14, 2021

i have tried them all and this one is the only one that replaces youtube player js with a small pic good work rocket team

cardamomclouds September 11, 2021

I uninstalled the plugin because it would not work with Ajax on my default archive page, which was essential. After deactivating and even uninstalling, however, I have a number of images not loading, either Admin Media area or on the display. When I open up the HTML, all the tags still have a loading="lazy" attribute. I can't find any correlation to which images do load and which don't. I have already cleared out my server cache. Any other advice?

matiasraby July 2, 2021

Before using this plugin my landing page was ranking poorly in PageSpeed Insights by Google. After using this plugin it went from 24% to 57% on mobile, and from 73% to 95% on desktop. Script size went from 1.6 Mb to 330.6 kb.

DICKY IBROHIM June 6, 2021

This really helps you to delay loading images. So easy to use that it deserves 5 stars

Carlo Alberto Bello March 12, 2021

Utilizziamo il plugin WP Rocket da anni installandolo su tutti i siti dei nostri clienti, la [Moderated: link redacted] consiglia a tutti gli utilizzatori di WordPress, di acquistare questo fantastico plugin.

huzaifa.ahmed February 12, 2021

works well but it will make a flicker on first load which causes breaking the layout.

Read all 122 reviews

Contributors & Developers

“Lazy Load” is open source software. The following people have contributed to this plugin.

“Lazy Load” has been translated into 9 locales. Thank you to the translators for their contributions.

Translate “Lazy Load” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.

Changelog

2.3.4

Enhancement: Allow <a> tags to lazyload background images
Enhancement: Add tag to lazyloaded picture elements
Bugfix: Prevent a Fatal error related to the League Container package conflict with WooCommerce 4.4
Bugfix: Update lazyload for background images support for new version of lazyload script
Bugfix: Correctly apply the rocket-lazyload class on elements with a background-image and an empty class value
Bugfix: Correctly apply the rocket-lazyloadclass on elements with malformed HTML
Bugfix: Prevent a display issue with background-images when using different types of quotes around the URL
Bugfix: Prevent Layout from breaking when alt attribute has any html encoded characters

2.3.3

Enhancement: Add data-skip-lazy and skip-lazy class to exclusions list as part of the interoperability initiative between lazyload plugins
Enhancement: Use native lazyload only if filter rocket_use_native_lazyload is true
Enhancement: Apply lazyload on background images set on figure elements
Bugfix: Correctly add the rocket-lazyload class when class attribute is empty on an element with a background image
Bugfix: Correctly replace YouTube iframe with preview image when using relative protocol
Bugfix: Preserve youtube-nocookie.com during LazyLoad

2.3.2

Bugfix: Incorrect characters used in Youtube thumbnail HTML code

2.3.1

Bugfix: Prevent a conflict with WP Rocket
Bugfix: apply loading=”lazy” on Youtube thumbnail
Bugfix: Add autoplay attribute on iframe loaded with Youtube thumbnail

2.3

Enhancement: Add support for browser native lazyload
Bugfix: Prevent broken image in some cases for picture element
Bugfix: Prevent wrong lazy attributes for srcset and sizes on an image inside a picture element

2.2.3

Enhancement: Improve compatibility for the picture element
Enhancement: Apply lazyload on background images set on section, span and li elements
Enhancement: also pass $width and $height values to the rocket_lazyload_placeholder filter
Bugfix: Use 0 instead of 1 for the default placeholder dimensions to improve compatibility
Bugfix: Improve infinite scroll support
Bugfix: Exclude Enfold avia-background-fixed background images and data-large_image from lazyload

2.2.2

Bugfix: Auto-exclude data-height-percentage attribute to prevent display issues
Bugfix: Correctly handle responsive videos using fitVids again

2.2.1

Enhancement: add a way to customize the lazyload script options
Bugfix: Prevent error on Internet Explorer 11
Bugfix: Prevent conflict with WooCommerce variation swatches
Bugfix: Prevent empty src when the image is an inline base64
Bugfix: Prevent issue when the original src attribute uses single quotes

2.2

Enhancement: Update lazyload script to the latest version
Enhancement: Use the dimensions of the original image for the placeholder size when possible, to reduce content reflow
Enhancement: Ignore images using the new loading attribute introduce by Chrome for browser-native lazyload

2.1.5

Bugfix: Prevent matching with the wrong data when a data-style attribute is on a div for background images
Remove data-cfasync=”false” by default
Enhancement: Add filter rocket_lazyload_script_tag to modify the lazyload script HTML if needed
Enhancement: Add data-no-minify attribute to the lazyload script tag to prevent it from being combined by JS combiners
Enhancement: Improve MutationObserver code to only call the lazyload update method if an image/iframe or element with .rocket-lazyload is contained in the new node(s) added to the DOM

2.1.4

Regression fix: Correctly exclude scripts from lazyload again

2.1.3

Bugfix: Ignore content inside noscript tags to prevent modifying them and causing some display issues

2.1.2

Enhancement: Update lazyload script to the latest version
Enhancement: Add a way to lazyload the Youtube thumbnail image
Enhancement: Add width and height attributes to the Youtube thumbnail image depending on the resolution
Enhancement: Disable polyfill for intersectionObserver by default, added a way to activate it instead
Enhancement: Add data-cfasync=”false” to the lazyload script tag
Enhancement: Prevent lazyload on the Oxygen Builder page editor
Bugfix: Wrap no JS CSS in noscript tag and remove the no-js identifier

2.1.1

Bugfix: Correctly apply lazyload on picture elements
Bugfix: Prevent double loading of an image when an img element inside a picture element only has a srcset attribute and no src attribute

2.1

Enhancement: Update lazyload script to the latest version
Enhancement: Apply lazyload on picture elements found on the page
Enhancement: Apply lazyload on div elements with a background image found on the page. See FAQ for more info.

2.0.4

Enhancement: Add filter for iframe lazyload pattern exclusion
Enhancement: Auto-exclude soliloquy-image pattern from lazyload
Bugfix: Prevent issue when an image/iframe is duplicated on the same page
Bugfix: Prevent W3C validation error for the SVG placeholder

2.0.3.2

Bugfix: Correctly ignore inline scripts with line breaks inside

2.0.3.1

Bugfix: Correct an issue preventing lazyload from working

2.0.3

Bugfix: Prevent incorrect display if JavaScript is disabled
Bugfix: Don’t apply lazyload on Divi/Extra/Beaver Builder Editor pages
Bugfix: Use the correct URL for each iframe when multiple iframes are on the same page
Bugfix: Ignore content inside inline script tags to prevent applying lazyload in it

2.0.2

Bugfix: Fix an error in the compatibility for the AMP plugin

2.0.1

Bugfix: Prevent a fatal error on case sensitive operating systems

2.0

Enhancement: Lazyload is now applied on the template_redirect hook, which should allow the plugin to apply the optimization on more images and encountering less conflicts at the same time
Enhancement: Specifically target with the lazyload script images/iframes elements with a data-lazy-src attribute
Enhancement: Update lazyload script to the latest version
Enhancement: Possibility to apply lazyload on background-images with a specific markup, see FAQ
Enhancement: Use a svg image as placeholder instead of a base64 gif
Bugfix: Only use MutationObserver if available in the browser
Bugfix: When using the Youtube thumbnail option, correctly format the Youtube query if the video URL is encoded
Bugfix: Improve iframe matching to prevent unexpected results
Bugfix: Update CSS for the Youtube thumbnail option to prevent issue with the Gutenberg embeds block

1.4.9

Enhancement: Update lazyload script to the latest available version
Enhancement: Use lazy-sizes to prevent W3C validation error when sizes is defined but srcset is not
Enhancement: Parse images or iframes only if the element is selected to be lazyloaded in the options
Fix: Prevent warning for lazyload+v in Google Search Console
Fix: Prevent PHP Notice with WooCommerce for product images

1.4.8

Notice: Minimum WordPress version required is now 4.7
Enhancement: Update lazyload script version
Enhancement: Remove placeholder image to improve perceived loading time
Enhancement: Compatibility with Youtube privacy URL
Enhancement: Update play image to match Youtube logo
Enhancement: Support Youtube URL parameters
Enhancement: Lazyload images displayed with wp_get_attachment_image(). /!\ no fallback if JavaScript is disabled
Fix: Use the correct size set in srcset for the lazyloaded image
Fix: Prevent Youtube thumbnail replacement on playlists
Fix: Prevent iframe lazyload on AMP pages
Fix: Correct text domain for translations (thanks @ Chantal Coolsma)

1.4.7

Fix compatibility with infinite scroll
Prevent lazyload on masterSlider images

1.4.6

Correctly include version 8.5.2 of lazyload script
Prevent 404 error on lazyload script if URL contains “-v”

1.4.5

Rename Setting Page Name in WP Menu
New Product Banner in Settings Page
Conditionally load a different version of the script depending on browser support of IntersectionObserver
Fix a bug where images initially hidden are not correctly displayed when coming into view (slider, tabs, accordion)

1.4.4

Admin Redesign

1.4.3

Plugin is compatible again with PHP < 5.4

1.4.2

Update lazyload script to bring back compatibility with IE9/10

1.4.1

Fix bug caused by a too aggressive cleanup

1.4

New option: replace Youtube videos by thumbnail. This option can improve your loading time a lot, especially if you have multiple videos on the same page

1.3.3

2017-09-16
Prevent scripts and styles being removed during html parsing

1.3.2

2017-09-12
Fix images not displaying in certain conditions because image attributes exclusion was not working correctly

1.3.1

2017-09-07
Don’t apply lazyload on Divi slider

1.3

2017-09-01
Improve HTML parsing of images and iframes to be faster and more efficient
Make the lazyload compatible with fitVids for iframes
Don’t apply lazyload on AMP pages (compatible with AMP plugin from Automattic)
Use about:blank as default iframe placeholder to prevent warning in browser console
Don’t apply lazyload on upPrev thumbnail

1.2.1

2017-08-22
Fix missing lazyload script
Don’t lazyload for images in REST API requests

1.2

2017-08-22
Update lazyload script to latest version
Change the way the script is loaded

1.1.1

2017-02-13
Bug fix: Remove use of short tag to prevent 500 error on some installations

1.1

2017-02-12
New
- JS library updated
- Support for iFrame
- Support for srcset and sizes
- New options page

1.0.4

2015-04-28
Bug Fix: Resolved a conflict between LazyLoad & Emoji since WordPress 4.2

1.0.3

2015-01-08
Bug Fix: Don’t apply LazyLoad on captcha from Really Simple CAPTCHA to prevent conflicts.

1.0.2

2014-12-28
Improvement: Add « rocket_lazyload_html » filter to manage the output that will be printed.

1.0.1.1

2014-07-25
Fix stupid error with new regex in 1.0.1

1.0.1

2014-07-16
Bug Fix: when a IMG tag or content (widget or post) contains the string “data-no-lazy”, all IMG tags were ignored instead of one.
Security fix: The preg_replace() could lead to a XSS vuln, thanks to Alexander Concha
Code compliance

1.0

2014-01-01
Initial release.

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