TLS does have session IDs / session tickets, which I believe can speed up session resumption. There is also TCP fast open, but I don't think it is used in prac

TLS does have session IDs / session tickets, which I believe can speed up session resumption. There is also TCP fast open, but I don't think it is used in practice. I don't think I've ever noticed it used when looking at a TCP capture. Though I'm sure either TLS session IDs or tickets are. I can't remember if one is more common that the other, it's been a while since I worked on that stuff directly.