title: How much network overhead does TLS add compared to a non-encrypted connection?
body: <p>(Approximately) how many more bits of data must be transferred over the network during an encrypted connection compared to an unencrypted connection?</p>
  
  <p>IIUC, once the TLS handshake has completed, the number of bits transferred is equal to those transferred during an unencrypted connection. Is this accurate?</p>
  
  <p>As a follow up, is transferring a large file over https significantly slower than transferring that file over http, given fast processors and the same (ideal) network conditions?</p>