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<link rel="dns-prefetch" href="//example.com">  //prefetch dns of domain which will be soon needed.
<link rel="prefetch" href="//example.com/demo.html"> //prefecth whole page or assets which the user woould most probably move next.
<link rel="preload" href="//example.com/demo.html"> //preload whole page or assets which will be required in same page

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@font-face {
  font-family: 'Source Sans Pro';
  font-style: normal;
  font-weight: 400;
  font-display: swap; /* swap fonts onload */
  src: url("...");
}

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/* That’s all, stop editing! Happy blogging. */
define( 'WP_MEMORY_LIMIT', '256M' );

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// Add this below content to your HTML page, or add the js file to your page at the very top to register service worker

// Check compatibility for the browser we're running this in
if ("serviceWorker" in navigator) {
  if (navigator.serviceWorker.controller) {
    console.log("NutPanda: active service worker found, no need to register");
  } else {
    // Register the service worker
    navigator.serviceWorker
      .register("sw.js", {

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self.addEventListener('install', function(event){
  event.waitUntil(
    caches.open('NutPanda-cache-v10').then(function(cache){
       return cache.addAll([        // add the links to assests you want to cache
        'https://demo.com/main.css',
        'https://example.co/min.css',
        
       ]); 
    })
  );    

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//Add this below content to your HTML page, or add the js file to your page at the very top to register service worker
if (navigator.serviceWorker.controller) {
  console.log('active service worker found, no need to register')
} else {
  //Register the ServiceWorker
  navigator.serviceWorker.register('/service-worker.js', {
    scope: './'
  }).then(function(reg) {
    console.log('Service worker has been registered for scope:'+ reg.scope);
  });