jquery - Javascript smoothscrolling still lagging -


i'm working on page: http://i333180.iris.fhict.nl/p2_vc/

after some of here, have added smooth scroll plugin.

however, noticed lot of scroll lag when page first opened.

what i've tried

  • i compressed background image 10 mb 2.2mb (1280 x 1024).

  • i moved background image div element, on content , not behind video.

    <div id="div_section_img"> <!-- content --> </div> 
    #div_section_img{     background: url("nature.png") no-repeat center center fixed;  }
    • in doing so, strange 'blank' line appeared between video , content section. think because video height set 100vh.

    i managed fix issue changing margin-top setting padding-top on #logo , footer element.

    #logo {     width: 410px;     **padding-top: 120px;**     margin-left: auto;     margin-right: auto;     margin-bottom: 0px; }  footer {     **padding-top: 100px;**     width: 100%;     height: 300px;     background-color: rgba(25, 25, 25, 0.8); }

while of has helped somewhat, there still noticeable amount of scroll lag.

how can rid of scroll lag?

smooth-scroll.js

$(function() {   $('a[href*=#]:not([href=#])').click(function() {     if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {       var target = $(this.hash);       target = target.length ? target : $('[name=' + this.hash.slice(1) +']');       if (target.length) {         $('html,body').animate({           scrolltop: target.offset().top         }, 1000);         return false;       }     }   }); });

from css-tricks tutorial

  • even scroll top 5000 lagging

update tried script instead of other scripts

        function start(){         $(function() {           $('a[href*=#]:not([href=#])').click(function() {             if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {                var target = $(this.hash);               target = target.length ? target : $('[name=' + this.hash.slice(1) +']');               if (target.length) {                 $('html,body').animate({                   scrolltop: target.offset().top                 }, 1000);                 return false;               }             }           });         });         function videoended() {             $('html,body').animate({                 scrolltop: $("#section").offset().top             }, 1000);         }     }     window.onload = start;

but still lagging

update 2 added 

var loading = $('html'); loading.addclass('loading'); $(window).load(function(){      loading.removeclass('loading'); });

code works, lag still noticeable

you need hide page while loading user doesn't start scrolling until has loaded.

  • add class the html tag hides body tag , adds loading image background of html tag
  • wait load
  • remove added class, restoring page natural state.

var loading = $('html');  loading.addclass('loading');  $(window).load(function(){      loading.removeclass('loading');  });
html.loading {      height: 100%;      background-image: url('http://i.imgur.com/heahf9v.gif'); /* animated loading spinner image */      background-position: center center;      background-repeat: no-repeat  }  html.loading body {      visibility: hidden;      height: 100%;      overflow: hidden;  }
<!-- demo purposes -->  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>  <img src="//lorempixel.com/1024/768">


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