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> Previously we’d been experimenting with Redis, Varnish and a few other technologies.

I read this paragraph and was a bit baffled. It sounds like they had merely been toying around with Varnish. I would think that heavy edge-level caching was essential to keep that kind of site up. Considering most content probably isn't personalised, it's basically a matter of serving a lot of static content fast.

They might be using Squid, which was the cache server of choice in the mid-2000s in the porn industry and was heavily used.

Yeah, that's probably it. I read it as if they only recently looked into http caching, but it may just be that they recently looked into that specific tool. Makes more sense then.

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