FreeBSD The best operating system for serve WEB and FTP has just announced yesterday, that the newest version is ready for production.
One of the most interesting thing is "The kernel now supports in-kernel framing and encryption of Transport Layer Security (TLS) data on TCP sockets for TLS versions ...".
FreeBSD 13 is the OS what we will use to ship our MVCP Webhosting Panel featuring "KTLS" built-in for instance with NGINX.
Our performance and experience is still clearly providing results of FreeBSD much faster than ANY linux distributions meanwhile the hardware supports become better.
Highly recommend to take a look into FreeBSD.