Sample code on how a website can hide page loading to look a lot faster. Full blog post here: https://www.atrakeur.com/blog/art34-rendez_votre_site_plus_rapide_simplement_avec_pjax_et_nprogress

app.js

//Configure pjax
new Pjax({
  elements: "a",                                          //Quel type d'élément binder pjax (les liens)
  selectors: ["title", ".mainContent", ".top-nav-menu"],  //Quels parties du html doivent changer entre les pages
});

//Configure NProgress
NProgress.configure({ 
  minimum: 0.1,
  rickleRate: 0.2,
  trickleSpeed: 250
});
  
//Start loading on pjax request
$(document).on('pjax:send', function() {
  NProgress.start();
})
//Stop loading when pjax is done (success or error)
$(document).on('pjax:complete', function() {
  NProgress.done();
})