The amount of page content affects the smoothness of the animation on mobile devices.

Ian's Avatar


16 May, 2015 09:55 AM

Hi Dmitry,

After testing on iOS and Android, I found that the amount of page content affects the smoothness of the animation of the slider on mobile devices.

At first, during the animation of the sliding of every slide, the animation paused like 0.1 second and then continued animating.

And after I removed other page contents and only left the slider itself on the page, the issue is gone.

Is there a way to fix this issue?

  1. Support Staff 1 Posted by Dmitry Semenov on 16 May, 2015 06:47 PM

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    Make sure that the specific element isn't causing the issue. In some cases if you overlay slider with some element that has box-shadow/text-shadow or with some pseudo-elements – animation issues can appear.


  2. 2 Posted by Ian on 17 May, 2015 03:31 AM

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    Hi Dmitry,

    The slider doesn't overlay with any element.

  3. Support Staff 3 Posted by Dmitry Semenov on 17 May, 2015 12:53 PM

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    Please link to the page with the issue.

  4. 4 Posted by Ian on 17 May, 2015 01:38 PM

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    Okay. Since this is currently an unfinished project of one of my clients, I couldn't make the url public. I had just sent the file to your Gmail inbox.

  5. Support Staff 5 Posted by Dmitry Semenov on 17 May, 2015 06:15 PM

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    If you look at the page closer, especially sidebar, you'll see that text blinks a bit during the navigation. It means that some elements are overlapping over the other hardware-accelerated elements.

    You can confirm this by opening Safari remote debugger and switching to Layers tab. According to Safari debugger here are elements that overlap (slider or each other):

    /* A and LI might be just in top menu or footer, haven't tested */
    /* P might be because it overlaps with something from above */
    p {
        -webkit-backface-visibility: hidden;
    /* because of border style on thumbs */
    .rsThumbsArrow {
        -webkit-backface-visibility: hidden;

    Forcing hardware acceleration on them (via backface-visibility) will remove the lag. But it's not ideal way to fix the problem, as it potentially can cause other performance issues on initial page load. As I posted before, such overlapping may be caused by :before, :after pseudo elements, look in your CSS.

  6. 6 Posted by Ian on 18 May, 2015 01:19 AM

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    Thank you for the explanation. I have to admit that I currently isn't a debug expert. Although I know how to use Firebug, using "Safari remote debugger" is beyond my ability.

    As mentioned in email, after removing all other contents, I found issue actually still exists, just became more slight. So maybe #contentinfo, #banner, a, li, p, ... etc aren't the causes. Please correct me if I'm wrong.

    And there is no CSS deceleration "-webkit-backface-visibility: hidden;" in my CSS files. So I'm not sure if I understand what you mean.

    As for ::before and ::after pseudo elements. I did use them on the .rsArrow and .rsThumbsArrow elements. But after I commented out the CSS rules related to the said pseudo elements, the issue still exists.

  7. Support Staff 7 Posted by Dmitry Semenov on 18 May, 2015 06:07 AM

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    And there is no CSS deceleration "-webkit-backface-visibility: hidden;" in my CSS files. So I'm not sure if I understand what you mean.

    You need to add CSS code from my above message to your page.

  8. 8 Posted by Ian on 18 May, 2015 06:33 AM

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    Thank you very much. With your above code, this issue has been fixed successfully.

    And please allow me to ask one more question about another issue at here since we still need the same files for the demonstration of the issue. But if I have to start a new thread to ask the issue, please let me know. The issue is that as soon as the slider finishes fading in the first slide (after the initialization), the first slide blinks one time. It happens only on mobile devices, too, not on desktop browsers. How could I prevent the blink from happening?

  9. Support Staff 9 Posted by Dmitry Semenov on 18 May, 2015 02:11 PM

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  10. 10 Posted by Ian on 18 May, 2015 02:22 PM

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    Thanks. If I understand correctly, the link explains how to avoid FOUC (Flash of Unstyled Content). However, my current issue isn't FOUC because it only happens after RoyalSlider is successfully initialized and right after the first slider finishes fading in.

  11. Support Staff 11 Posted by Dmitry Semenov on 18 May, 2015 07:23 PM

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    For some reason I can't repeat the issue on page that you sent. Try using such markup for first slide(s):

       <img src="slide-1-image.jpg" />
       <img src="slide-2-image.jpg" />

    ... slider will ignore such images, so you'll need to handle scaling and centering of them by yourself via CSS or JS.

  12. 12 Posted by Ian on 19 May, 2015 03:04 AM

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    Well, I checked it again and found it only happens on iOS, not on Android. Anyway, thanks for your suggestion.

  13. 13 Posted by Genc.TR on 30 Dec, 2018 07:49 PM

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    Hi Dmitry,

    Same blinking issue for the slider animation (only on the first loop*).

    I did my best with debugging & layers but couldn't find a proper solution. Can you please help me about the code I need to add to CSS?

    Thank you in advance.

    The url:

  14. Support Staff 14 Posted by Dmitry Semenov on 30 Dec, 2018 08:12 PM

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    @Genc.TR please elaborate on which exactly device & browser do you get the issue.

  15. 15 Posted by Gencer Soytemiz on 30 Dec, 2018 08:14 PM

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    On android & chrome.

  16. Support Staff 16 Posted by Dmitry Semenov on 30 Dec, 2018 11:15 PM

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    @Genc.TR, likely this is happening because you're using too large images and the first delay is caused by decoding. Either reduce size in Image Options, or use custom WordPress image size, or use responsive images.

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