Note: TIL: Paint timing metrics are too optimistic.… - Nicolas Hoizey

TIL:

Paint timing metrics are too optimistic. In 85-95% of cases, they are recorded before any pixels are actually rendered to the screen.

From @Joseph_Wynn's article for #SpeedCurve: https://speedcurve.com/blog/an-analysis-of-chromiums-paint-timing-metrics/

older note:
Note from 20 June 2020
newer note:
Note from 25 June 2020

- Nicolas Hoizey
- 26 October 2022
- image, SpeedCurve, WebPerf
- 9 reactions
- permalink
This is what happens when you preload the heavy high definition pristine image instead of the responsive version… 😅

Thanks #SpeedCurve for noticing it! 🙏
Can we monitor User Happiness on the Web with performance tools?
- Nicolas Hoizey
- 10 January 2020
- WebPerf, SpeedCurve
- 27 reactions
I really like that SpeedCurve tried to innovate with this recent "User Happiness" metric (original version). It aggregates multiple technical metrics to decide if users visiting the page are happy or not with it. But I see several issues in this metric.