How to Use Native Lazy Loading in WordPress

Why You Need It

Native lazy loading is more efficient than JavaScript-based lazy loading because it’s handled by the browser’s rendering engine. This option uses native when available, with a JS fallback.

How to Enable this Feature

Step 1: Navigate to Settings

Click into the Classic Monks plugin settings, then the Performance tab, Lazy Loading subtab.

Step 2: Enable the Feature

Toggle on the feature.

Step 3: Save and Test

Click Save Changes. Test on the frontend.

Common Use Cases

Modern browsers

For sites with mostly modern browser visitors, native lazy loading is faster and lighter than JavaScript-based solutions.

Progressive enhancement

Using native with a JS fallback ensures all browsers get lazy loading, but modern browsers get the optimized version.

Troubleshooting

The feature is not taking effect

Cause: The toggle is off, or a caching plugin is serving the old page.
Fix: Verify the toggle is on. Clear all caching layers.

The feature breaks another plugin

Cause: Another plugin depends on the functionality that this feature disables.
Fix: Disable this feature if it breaks another plugin.

Developer integration

This feature registers 2 WordPress hooks in lazy-loading.php:

Actions:

• init calls cm_disable_native_lazy_loading() (Conditionally disables WP native lazy loading (priority 5))

Filters:

• wp_lazy_loading_enabled calls __return_false() (Disables native lazy loading attribute)

// Hooked in lazy-loading.php
add_action( 'init', 'cm_disable_native_lazy_loading' );

The feature modifies WordPress behavior by registering or removing hooks. Disabling it reverses those changes and WordPress returns to its default behavior.

Before you enable this feature

1. Test on staging first to verify no conflicts with your theme or other plugins
2. Check dependent plugins that may rely on the functionality being modified
3. Monitor after enabling for any unexpected behavior on the frontend

How it works under the feature

This feature runs during the WordPress initialization phase. When enabled, its PHP code registers hooks that modify specific WordPress behaviors. The changes are non-destructive and reversible.

No database schema changes are made. The feature state is stored as a boolean value in the wp_options table and can be toggled at any time from the admin settings.