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I'm betting they don't just use NGINX, but also specialized hardware.

Cloudflare has an article on introducing specialist hardware to their stack [0]

[0] https://blog.cloudflare.com/asics-at-the-edge/

Not the same type of specialized "CDN Hardware" that was implied in the parent, this is just "big network" customization at the packet forwarding layer.

They don’t use NGINX anymore

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