In addition to what elithrar is saying, take a look at some of the stuff at https://istlsfastyet.com https://istlsfastyet.com Things like TLS False Start, TLS

In addition to what elithrar is saying, take a look at some of the stuff at https://istlsfastyet.com https://istlsfastyet.com Things like TLS False Start, TLS Resumption, TCP Fast Open, and more can really help reduce that pretty well. Also, take a look at the book linked at the bottom of that page which includes a pretty comprehensive section on improving RTT and TLS speeds in general. (https://hpbn.co/transport-layer-security-tls/ https://hpbn.co/transport-layer-security-tls/)