jquery-migrate.min.js to keep support for older theme and plugin developments. It was originally created as an alternative or replacement for the jQuery library from any other services in order to limit the loading of external scripts.
The script is useful in older developments up to version 1.9 of the library. Now there is practically no need to use this file.
Add this code to function.php file
function remove_jquery_migrate( &$scripts ) {
if( !is_admin() ) {
$scripts->remove( ‘jquery’ );
$scripts->add( ‘jquery’, false, array( ‘jquery-core’ ) );
}
}
add_filter( ‘wp_default_scripts’, ‘remove_jquery_migrate’ );