The Resource data in traces provides Blink-layer timings of starting and finishing requests. Netlog and Network domain data provides network layer timings. These figures can diverge considerably, for example: if the main thread is busy for 3 seconds, an image that completed downloading cannot be painted. [1]

An ideal situation is that we marry the two data sources so we can have the entire picture.
See attached screenshot.


Without this, the renderer-POV of network requests are misleadingly long. And the net-POV of requests complete earlier than the page has access to them.


[1] https://github.com/perfs/audits/issues/1#issuecomment-193979787
 

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