Write content: Chapter 7: Performance

[rviscomi]

Part	Chapter	Authors	Reviewers	Analysts	Metrics	Analysis
II. User Experience	7. Performance	@rviscomi	@JMPerez @OBTo @sergeychernyshev @zeman	@rviscomi @raghuramakrishnan71	#9	#88

Due by: October 7

• Review the results spreadsheet and work with your analyst(s) (@rviscomi @raghuramakrishnan71) if you have any questions about the data.
• Write the contents of your chapter and get it peer reviewed (@JMPerez @OBTo @sergeychernyshev).
• File a PR to merge your written contents in markdown format to the src/content/en/2019 directory.

Refer to the Authors' Guide for writing advice.

[rviscomi]

@zeman I've sketched out a very rough outline of the chapter here. How does that look to you?

Any questions/concerns about the lab data in the results sheet?

[zeman]

@rviscomi the outline looks promising. Unfortunately this is really poor timing for me as I'm away on holiday till the 14th. If the deadline is the 7th then I'm afraid I can't take on the writing. I'm still happy to be a reviewer when I'm back.

[rviscomi]

Ahh ok thanks for the update @zeman. We can stall the release of this chapter, or at least the Lab section, until you're available. I'd still love to have your contributions. I'll check in with you again after you're back from holiday.

[rviscomi]

@JMPerez @OBTo @sergeychernyshev please have a look at this draft of the field performance section. When @zeman's lab performance section is complete we can work on a unified intro/conclusion.

[foxdavidj]

@rviscomi I'm planning on reviewing this over the weekend. I'll let you know when I've finished :)

[sergeychernyshev]

Same here.

[rviscomi]

Thanks @OBTo and @sergeychernyshev!

[sergeychernyshev]

Left a few comments in the doc.

[rviscomi]

I heard from Mark via email that he's unable to commit to writing the Lab section. Given the state of the deadline let's stretch the Field section to the entire chapter. I'll work on rewriting it to fit the new context.

[rviscomi]

@sergeychernyshev @OBTo @JMPerez @zeman @hakimelek I've revised the intro/conclusion and it's ready for another review: https://docs.google.com/document/d/1S0De_lBFCuqLWa2ZlB31SKQZE_zkboweeAUWLrcDuLw/edit?usp=sharing

[logicalphase]

I'll do a review later tonight or morning. Thanks.

[rviscomi]

I'll be rewriting a bit of our FCP and FID analysis to include new and unreleased (shhhh!) PSI thresholds:

Metric	Fast	Slow	Moderate
FCP	p75 at 1000ms	p25 at 3000ms	Everything else
FID	p95 at 100ms	p05 at 300ms	Everything else

Notable changes:

• rename "average" to "moderate"
• lower barrier to fast FCP from p90 to p75
• increase barrier to fast FID from 50ms to 100ms

I plan to include the old results for comparison and also for a more accurate representation of "the state of web performance as of July 2019". Having these new thresholds in the Almanac will go a long way to making these results more relevant at CDS.

cc @igrigorik