Support reveal's lazy loading feature
https://github.com/hakimel/reveal.js#lazy-loading
I use a lot of images and iframes, so this is essential. It ought to be the default (and maybe it is).

We use reveal.js’ lazy-loading with the default viewDistance setting (3) for all Slides presentations. I don’t think it makes sense to expose viewDistance as a setting since it’s not something most people need to think about.
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Albert commented
Any word on the preloading for iframes? Is it possible?
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Chris commented
This doesn't seem to be working for iframes. They are only initiating loading when the presentation gets to that slide.
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Max Rahder commented
You'd need to let us set the viewDistance preload count too, to avoid getting a load delay on every page.