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September 30, 2021 02:19
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Preload site logo and LCP image in WordPress
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| <?php // don't copy this line | |
| /** | |
| * Modify the $image_id variable and replace 'medium_large' with desired image size | |
| * See: https://web.dev/optimize-lcp/?utm_source=lighthouse&utm_medium=unknown#preload-important-resources | |
| * Note: don't go overboard and preload too many assets, just ones that appear above the fold | |
| */ | |
| add_action( 'wp_head', 'child_preload_assets', 1 ); | |
| function child_preload_assets() { | |
| // Preload the logo on every page | |
| echo "<!-- preload logo -->\n"; | |
| echo '<link rel="preload" as="image" href="'. esc_url( wp_get_attachment_url( get_theme_mod( 'custom_logo' ) ) ) .'">'; | |
| // Preload LCP image on important pages | |
| if ( is_front_page() ) { | |
| echo "<!-- preload LCP image -->\n"; | |
| $image_id = 5812; | |
| $image = wp_get_attachment_image_src( $image_id, 'medium_large' ); // returns array of image data | |
| $srcset = wp_get_attachment_image_srcset( $image_id, 'medium_large' ); | |
| $sizes = wp_get_attachment_image_sizes( $image_id, 'medium_large' ); | |
| if ( $image ) { | |
| echo '<link rel="preload" as="image" href="'. $image[0] .'" imagesrcset="'. $srcset .'" imagesizes="'. $sizes .'">'; | |
| } | |
| } | |
| } |
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