Preloading technique (preload, prefetch, preconnect)

The page load time depends on the load time of 3rd party resources. To reduce page load time, you can use several techniques of preloading.
add_action('wp_head', function(){
<link rel='dns-prefetch' href='https://www.googletagmanager.com' />
<link rel='dns-prefetch' href='https://connect.facebook.net' />
<link rel='dns-prefetch' href='https://cdn.autoads.asia' />
<link rel='dns-prefetch' href='https://www.google-analytics.com' />
<link rel='dns-prefetch' href='https://www.youtube.com' />
<link rel='dns-prefetch' href='https://api.autoads.asia' />
<link rel='dns-prefetch' href='https://www.facebook.com' />
<link rel='dns-prefetch' href='htpss://googleads.g.doubleclick.net' />
<link rel='dns-prefetch' href='https://maps.googleapis.com' />
<link rel='dns-prefetch' href='https://scontent-ort2-1.xx.fbcdn.net' />
<link rel='dns-prefetch' href='https://i.ytimg.com' />
<link rel='dns-prefetch' href='https://yt3.ggpht.com' />
<link rel='dns-prefetch' href='https://static.doubleclick.net' />
<link rel='preconnect' href='https://fonts.gstatic.com' crossorigin />

Multiple language

For multilingual sites, in url has contain language code ex: http://example.com/en/post-1
So you need to add all language codes that your site using to this filter:
add_filter('hpp_url_langs', function(){return 'en|vi|ja';});

Disable Optimal on some pages

Remember that optimization will only work in the frontend (not logged user) and It makes no sense to wp-admin.
You don't want to turn on optimization on certain pages for some reason. Ex: checkout page, cart page..
add_filter('hpp_should_lazy', function($v){
if(!is_user_logged_in()) {
foreach($uris as $uri) if(stripos($_SERVER['REQUEST_URI'], $uri)!==false ) return false;
else $v=false;
return $v;
Using the function hpp_shouldlazy() to known whether the current page is optimally enabled or not:
add_action('wp_head', function(){
if(!hpp_shouldlazy()) echo '<script>if(typeof $=="undefined" && typeof jQuery!="undefined")$=jQuery;</script>';

Purge cache

When you press 'purge all' in settings > wp2speed , then all files in the wp-content/cache/ & wp-content/mmr folders will be deleted. When you reload the page you may feel a bit slower, because the merge files & cache files being created.
If you want to do something more during clean the cache process, use the hook:
add_action('hpp_purge_cache', function(){
//do something
@mkdir(WP_CONTENT_DIR.'/cache/caos-analytics', 0755,true);


Modify any html in buffer output.
add_filter('hpp_prepare_buffer_html', function($html, $merged=null){
$html = str_replace('http://', 'https://', $html);
$html = str_replace('http:\/\/', 'https:\/\/', $html);
return $html;
},10, 2);


If you plan to use cdn, ex: https://net-soledad-gavu0xo8w0ybxpt6g.netdna-ssl.com/wp-content/uploads/2017/07/[email protected] use this hook to replace with your cdn for css,js files in mmr folder.
//change to your cdn
add_filter('hpp_cache_url', function($url){
$url = str_replace(siteurl(), 'your-cdn', $url);
return $url;