What could be causing the sluggish performance of my JavaScript code?

Could someone offer insight into why my JavaScript code is performing slowly?

Are there any optimizations I can implement to improve its speed?

Thank you!

$(document).ready(function() {

/* Trigger animation when window is scrolled */
$(window).scroll( function(){

    /* Check the position of each target element */
    $('.hideme').each( function(i){

        var bottom_of_object = $(this).offset().top + $(this).outerHeight();
        var bottom_of_window = $(window).scrollTop() + $(window).height();

        /* Fade in element if it's fully visible in window */
        if( bottom_of_window > bottom_of_object ){

            $(this).animate({'opacity':'1'},500);

        }

    }); 

});

});

Answer №1

I happened to notice a pattern of unnecessary calls to $() in your code when referencing this and window. I have a small performance improvement suggestion for you:

$(document).ready(function() {

$(window).scroll( function(){

    $('.hideme').each( function(i){

        var $el = $(this),
            $window = $(window),
            bottom_of_object = $el.offset().top + $el.outerHeight(),
            bottom_of_window = $window.scrollTop() + $window.height();
            
        if( bottom_of_window > bottom_of_object )
           $el.animate({'opacity':'1'},500);

    }); 

});

});

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