pp-wp-snippet-replace-jquery.php

<?php
// This code snippet replaces the link to the locally hosted jQuery core with the link to the jQuery core hosted on jQuery CDN

// This reduces server load and page load time

// We do not use wp_deregister_script and wp_register_script but we directly access the global variable $wp_scripts
// because we want to replace the script with the correct version number

add_action( 'wp_print_scripts', 'replace_jquery' );

function replace_jquery() {
  
  global $wp_scripts;
  $wp_scripts->registered['jquery-core']->src = 'https://code.jquery.com/jquery-' . $wp_scripts->registered['jquery-core']->ver . '.min.js';

}

?>