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styke

Increase Draggable/throwProps touch performance?

Warning: Please note

This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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Hi there! I've been using Draggable and throwProps plugin to create a cool x/y slider. The problem is, as soon as I start adding images and content, the touch performance becomes quite bad - a lot of the times the touch isn't registered and the animations stutter. 

 

I was wondering - what are some good practices (if any) to optimize this kind of interaction? To give you an idea of what I'm dealing with, here's just a bit of the DOM I'm dealing with. 

<div id="homepage-slider">
<div id="slider-reel">
<div class="slide" type="casino"><div class="bottom-part"></div></div>
<div class="slide" type="poker"><div class="bottom-part"></div></div>
<div class="slide" type="sports"><div class="bottom-part"></div></div>
</div>
</div>

every .bottom-part element has a background image on it. The performance becomes especially bad when the background is resized, which is kind of important for mobile! 

 

Thanks  :)

 

EDIT: Maybe the mechanics of the slider play a role - if so a quick explanation. #slider-reel is an absolutely positioned element being 100% of the width and height of the container. I am able to sort the slides horizontally by specifying left: 100%, left: 200% and so on. Then I just initialize the thing with this: 

    var slider = Draggable.create("#slider-reel", {
     type:"x, y",
     edgeResistance:0.65,
     lockAxis: true,
     throwProps: true,
     throwResistance : 3000,
     snap:{
         x : values,
         y : 0 - $(document).innerHeight()
     }
    });

values is an array of dynamically generated 'stops' off to the left of the screen, for the #slider-reel to snap to. If this information is important, and you would like to know more, please let me know! Thanks!

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Yikes, it looks like your post fell through the cracks here in the forums. Sorry about that. 

 

It's super difficult to troubleshoot a performance issue blind, so would you please create a simplified codepen or jsfiddle that demonstrates the issue? That way, we can take a peek at what's really bogging things down. Typically the performance issues have nothing to do with Draggable or GSAP - the biggest culprit is graphics rendering (people using very large images or complex styles/filters, etc.). 

 

Oh, and I'd highly recommend setting visibility:hidden on the elements that are off the stage/screen, just to optimize performance and tell the browser it doesn't have to worry about rendering those. 

 

Here's a barebones Draggable codepen that you can fork if you'd like:

http://codepen.io/GreenSock/pen/nIAyg

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