One reason to use up-to-date #Linux kernels on your production servers is that they can do things faster. Linux 4.13+ has kTLS or kernel-level (!) TLS stack.
https://www.kernel.org/doc/html/latest/networking/tls-offload.html
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OpenSSL support (required by Nginx, Apache etc) seems to be in progress https://github.com/openssl/openssl/pull/10489
