The color codes for the Network tool:
Firefox
pink - DNS lookup
orange - connecting
dark slate-blue - waiting
green - receiving
Chrome
Connecting
white with pale grey outline - queuing
grey - stalled - waiting before it could be sent, incl time spent in proxy negotiation. + while browser waits for one of Chrome's max. 6 connections per location to become available for re-use
orange - establish connection, including TCP handshakes/retries and negotiating a SSL
Request/response
green - request sent issuing the network request. Typically a fraction of a millisecond.
green - waiting - Time to First Byte (TTFB) - incl the latency of a round trip to the server in addition to the time spent waiting for the server to deliver the response
blue - content download - Time spent receiving the response data
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