Manual:$wgNativeImageLazyLoading

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Files and file uploads: $wgNativeImageLazyLoading
Toggles native image lazy loading, via the "loading" attribute.
Introduced in version:	1.34.0 (Gerrit change 531442; git #3b7eecf)
Removed in version:	Still in use
Allowed values:	(boolean)
Default value:	`false`
Other settings: Alphabetical \| By function

Details

If set to true, enables native MediaWiki LazyLoading for all images on site. LazyLoading technology allows images to load gradually as an user scrolls the page, reducing server load.

To activate it, you just need to add in your Localsettings.php the following code:

$wgNativeImageLazyLoading = true;

No additional configuration needed.