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They've only had a few weeks to scale up from a few thousand to a few hundred thousand concurrent websocket connections. It's weird that it works great sometimes, and other times it doesn't.

I'd love to read their engineering blog!

Streaming video in the conventional case may be a solved problem, but HQ has the additional (and seemingly unique to me) challenge of needing the streams to be nearly perfectly in sync. It's less like a bunch of people streaming HBO and more like half a million folks viewing a live webinar or something.

I can imagine WebEx, a far more established and mature product, might cough a bit too.

For me, the questions and answers are always served but the video rarely shows. Which honestly works for me because I find the host pretty annoying.

In my experience it's the video that's the problem.