https://accedian.com/blog/diagnose-tcp-connection-setup-issues/
A TCP connection, also called 3-way Handshake is achieved with SYN, SYN+ACK and ACK packets. From this handshake, we can extract a performance metric called Connection Time (CT), which summarizes how fast session a can be set up between a client and a server over a network. For more details, see this excellent article on Wikipedia.
