I suggest you ...

Give us an option to not preload a slide

I have a large presentation file with many iframes to demo content within.

This causes the load of the presentation to lag whilst it spends ages preloading all of the content.

Either give us a global switch to not preload or perhaps a control within the 'iframe' option that allows us to determine if the content is preloaded or loaded when the slide comes into view.

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    Courtney shared this idea  ·   ·  Admin →
    completed  ·  AdminOwen (Owner, Slides) responded  · 

    Just confirmed this to be working. Iframes are only loaded for the three nearest slides. This is checked every time you navigate, if a new iframe appears within the 3-slide distance it will start loading.

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      • Anonymous commented  · 

        I would like an ability to request the loading of an iframe some tunable number of slides before the slide holding the iframe.

        The delay loading a YouTube video when showing the fragment that has the iframe of the YouTube video looks amateurish.

      • AdminOwen (Owner, Slides) commented  · 

        We revised this a week ago; iframes now only load for the current slide when it becomes visible, no preloading. Iframes are now also unloaded as soon as the slide is hidden.

        Note that this change only applies to the new Slides editor released in September 2014. Decks created prior to that will still preload iframes three slides ahead.

      • Dave Deriso commented  · 

        I'd really like this feature to be implemented. I'm teaching a class that uses interactive javascript graphics rendering and when all of my iframes load at once, the whole presentation grinds to a halt. Can you please fix this?

      • Courtney commented  · 

        It's a bit better but you still run into a problem if the nearest 3 slides are all loading in iframe content.

        This is a good default but granular control of each iframe would be best. When we host our own reveal.js instances we have some simple javascript running in the back ground that allows us to do this.

      • AdminOwen (Owner, Slides) commented  · 

        Thanks for reporting. There has been regression here – we have logic in place for only loading iframes in the nearest three slides but it's stopped working. We'll report back when it's been fixed.

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