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I can confirm that Slideshare is eating all CPU, maybe use Speaker Deck: https://speakerdeck.com/

Or start using HTML for slides. like with text and stuff, not images.

I think it's a SlideShare issue unrelated to this site. On my system, SlideShare bumps the CPU usage up to 50% or more in both Firefox and Chrome.

Thanks. We had another report of that too, unfortunately we do not have much control over the slideshare embed, but we are working with them on it.