Plugin / Lazy Loader

Florian Brinkmann, MarcDK



Lazy loading plugin that supports images, iFrames, video and audio elements and uses the lightweight lazysizes script. With manual modification of the markup it is also possible to lazy load background images, scripts, and styles.

Lazy loads (without the need of any manually modifications):

  • Images inserted via img or picture in posts, pages, Custom Post Types, Text Widgets, …
  • Post thumbnails.
  • iFrames.*
  • Video elements.*
  • Audio elements.*

* Can be enabled in the plugin options.

The plugin comes with the following options (under Settings › Media › Lazy Loader options):

  • Do not lazy load elements with specific CSS classes.
  • Enable lazy loading for iFrames.
  • Include the lazysizes native loading plugin that modifies images and iFrames to use the native lazy loading feature of browsers that already support it.
  • Include the lazysizes unveilhooks plugin that adds support for more elements, for example, video and audio elements.*
  • Enable lazy loading for the poster frame of video elements.
  • Enable lazy loading for audio elements.
  • Enable lazy loading for inline background images.
  • Include lazysizes aspectratio plugin. This plugin calculates the needed space for images before they are loaded. That avoids content jumping when the images are loaded and makes the lazy loading work with masonry grids.
  • Display a loading spinner.
  • Disable the plugin on specific posts/pages (this shows a checkbox in the edit view of all public post types (except attachments) to disable lazy loading for an entire post).
  • A textarea to modify the default lazysizes config values.

* The unveilhooks extension of lazysizes supports more than video and audio elements, but you need to manually modify the markup to use it for:

  • Background images.
  • Scripts.
  • Styles.

The plugin adds a noscript element as fallback for disabled JavaScript.

The auto-modifying of the image markup does not work for images that are added using wp_get_attachment_image(), because there cannot be a noscript fallback added.

You can disable lazy loading for elements with specific CSS classes by defining them via the plugin settings (SettingsMediaLazy Loader options). Or use the data-no-lazyload attribute.

If you want to disable lazy loading for a specific element and its children (for example, if you have no access to the classes of the image element), you can use the disable-lazyload class.


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