TLS 1.3 has been out for a while now, and always promised performance improvements (for example, see this Cloudflare article from Sep 2016: https://blog.cloudflare.com/introducing-tls-1-3/). I wonder why Netflix is only getting to it now? Even if some clients didn't support it yet, seems like they could still introduce support on the server side?
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Just guessing: it could be related to the fact that they have been reported to use an unusual setup (kernel TLS on BSD). https://2019.eurobsdcon.org/slides/Kernel%20TLS%20and%20TLS%...