TLS Abbreviated Handshake looks like this:#
Client (with SessionID) Server
ServerHello (with SessionID)
Application Data <-------> Application Data
TLS Session Resumption
is one of the most important mechanism to improve TLS Handshake
performance: by submitting an appropriate blob to the server, a client is able to trigger an abbreviated handshake, improving latency and computation time.
There might be more information for this subject on one of the following: