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Collect First Input Timing
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Description

This gives us First Input Delay, and more information.

Google seems to be judging us by FID, as it's found in CrUX and now in their Search Console Speed Report. They are now pushing the newer Total Blocking Time, but based on its existing prevalence, it seems likely that search ranking might take FID into account and not TBT yet.

Event Timeline

Gilles created this task.Nov 12 2019, 2:03 PM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptNov 12 2019, 2:03 PM
Peter added a subscriber: Peter.Nov 12 2019, 6:34 PM

If we just care about Chrome we can use the performance observer for
first-input, I've used it here - it supports buffered too so we don't have to add things in head.

It was released in 77 if that's enough for us, then at least we can start tracking it there?

Oh ok, perfect. Yes, let's do that.

Gilles renamed this task from We should track First Input Delay (FID) in our RUM metrics to Collect First Input Timing.Dec 16 2019, 1:41 PM
Gilles updated the task description. (Show Details)
Gilles claimed this task.Mon, Jan 6, 1:15 PM
Gilles triaged this task as High priority.