Website Performance

Hi, I am testing my site’s speed and having some bad score on Defer parsing of JavaScript.

I found this thread (https://xtemos.com/forums/topic/how-i-get-94100-at-gtmetrix-page-speed-score-the-plugins-code-snippets-used/),
and it shared some codes to be added into function.php, may I know if this code workable and will this code affect the woodmart theme?

Please advise, thanks.

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5- Add this code to your (Woodmart child theme) function.php

// Defer jQuery Parsing using the HTML5 defer property
if (!(is_admin() )) {
function defer_parsing_of_js ( $url ) {
if ( FALSE === strpos( $url, ‘.js’ ) ) return $url;
if ( strpos( $url, ‘jquery.js’ ) ) return $url;
// return “$url’ defer “;
return “$url’ defer onload='”;
}
add_filter( ‘clean_url’, ‘defer_parsing_of_js’, 11, 1 );
}
Explanation: The above code simply Defer parsing of JavaScript, Defer parsing JavaScript helps you a lot reduce blocking of page rendering and make it skyrocket fast loading.

6- Get rid of WordPress meta generator tags, which displays your website’s WordPress version, and all of the other plugins meta generators as well for anyone to see. This can be a security risk for your website but it is easy to remove by using the below function.

// Remove All Meta Generators
function remove_meta_generators($html) {
$pattern = ‘/<meta name(.*)=(.*)”generator”(.*)>/i’;
$html = preg_replace($pattern, ”, $html);
return $html;
}
function clean_meta_generators($html) {
ob_start(‘remove_meta_generators’);
}
add_action(‘get_header’, ‘clean_meta_generators’, 100);
add_action(‘wp_footer’, function(){ ob_end_flush(); }, 100);
7- Another speed factor is to remove Emoji styles and scripts which help increase performance and lower JavaScript and CSS resources.

// Remove Emoji Styles and Scripts
remove_action( ‘wp_head’, ‘print_emoji_detection_script’, 7 );
remove_action( ‘admin_print_scripts’, ‘print_emoji_detection_script’ );
remove_action( ‘wp_print_styles’, ‘print_emoji_styles’ );
remove_action( ‘admin_print_styles’, ‘print_emoji_styles’ );