SSL / TLS handshake

The portion of connect time spent negotiating TLS, shown separately for inspection.

This is a breakdown of `connect`, not an additional phase: the spec defines it as contained within connect, so a waterfall or a total must never add ssl on top of connect without subtracting it back out first. A large value here points at certificate chain size, OCSP stapling, or a slow TLS resumption path rather than at anything the server's application code controls.

Other timing phases

• Blocked — Time spent queued before the browser could even open a connection for this request.
• DNS — Time spent resolving the hostname to an IP address.
• Connect — Time spent establishing the TCP connection, including the TLS handshake for HTTPS.
• Send — Time spent writing the request onto the wire.
• Wait (TTFB) — Time between the request finishing transmission and the first byte of the response arriving.
• Receive — Time spent reading the response body after the first byte arrived.