Hi @guillaumemillot.
The online guide does imho not yet exist. But there is this FAQ entry https://matomo.org/faq/how-to/how-do-i-see-page-performance-reports/
Not sure if we will work on a online guide in the next weeks. Otherwise we maybe should remove or change that link. ping @mattab @tsteur

Those metrics should actually be tracked automatically whenever the browser supports the performance timings.

@sgiehl I don't think we will create a guide for it soon so maybe we just remove the link or we link to https://matomo.org/faq/how-to/how-do-i-see-page-performance-reports/

@tsteur could we maybe forward https://matomo.org/docs/page-performance/ to https://matomo.org/faq/how-to/how-do-i-see-page-performance-reports/ for now, so we don't need to adjust the code again if we decide to write a guide for it?

@sgiehl while it's only a visualisation that is not shown by default I don't think we will be writing a guide for it but it might eventually change once we move the page performance report into it's own subcategory in the reporting menu. I guess we could then still change the link or then redirect faq link to docs link? I can create the link if needed but prefer not to because we don't know if we ever will create one and it's easier to redirect any URL later if needed.