Why does JavaScript perform so sluggishly in IE?

Apologies for my lack of experience as a beginner programmer and any language errors due to not being a native English speaker.

I have a web page that, when certain click events occur, it triggers some JavaScript and loads content into an iframe using PHP. The iframe also runs additional JavaScript actions on itself and the parent page. While everything works smoothly in Firefox, I'm noticing major slowdowns in Internet Explorer. One key feature is changing the opacity of images on mouse up, but IE takes over 2 seconds to display the new opacity. Why is this happening? And more importantly, how can I resolve this issue?

Thank you in advance, Irene

javascriptinternet-explorerperformance

Answer №1

When it comes to JavaScript performance, IE falls behind other major browsers, especially IE8 (excluding IE9+). It may be necessary to adjust certain settings or optimize scripts specifically for IE in order to improve speed.

For example, disabling fade effects or reducing the number of frames can help improve performance on IE due to its slower DirectX opacity filter compared to other browsers in most cases.

To identify and address performance issues specific to IE, I recommend using dynaTrace AJAX edition, a free performance profiler designed specifically for IE.

Answer №2

Explore benchmarks highlighting the sluggishness of Internet Explorer:

It may be necessary to try out various methods of DOM manipulation to enhance performance on IE.

Answer №3

It's no secret that IE has a reputation for being sluggish (pun intended). Without knowing the specifics of your project, it might be worth considering removing certain effects for IE users to improve speed. If you're making frequent DOM changes, that could also be contributing to the slow performance.

If you can share some code snippets, I'd be happy to provide suggestions on optimizing performance.

Answer №4

Alright, here is the script that seems to be causing a lot of issues. Any thoughts on how we can improve this?

$(document).ready(function() {

$("#myTable").draggable({
    containment:'parent',
    drag:function() {
        $("#myTable").css("opacity", "0.6");
        $("#myTable").css("background-image", 'none');
        $("#galframe").css("opacity", "1.0");

    },
    stop:function(){
        $("#myTable").css("opacity", "1.0");
        $("#galframe").css("opacity", "0.6");
        var $image = $("#galframe").contents().find("#jgal div.active img");
                var src=$image.attr("src");
                $("#myTable").css("background-image", 'url(' + src + ')');
                $position = $("#myTable").position();
                $("#myTable").css("backgroundPosition", (-parseInt($position.left)+549).toString()+ "px " + (-parseInt($position.top)+20).toString() + "px");
                $("#myTable").css("background-repeat", "no-repeat");
            }
});
});

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