Using FCP as timing point only measures a subset of abandonment

[andydavies]

FCP's appealing because it's a clearly defined point in the page load lifecycle but I suspect it's too early to measure abandonment.

I've had a few clients lately where the menu bar has rendered by the content has taken a while to arrive and we've seen visitors abandon while waiting for the main content.

To me it feels like we should treat someone leaving before the page is useful, or usable as abandonment but aware that's probably not possible for browsers to measure without the page being instrumented.