1542396 - Image loading from cache does not get a PerformanceEntry

Status: RESOLVED DUPLICATE of bug 1113676

(Core :: Performance, defect, P3)

Description

[Will Hawkins]

In violation of the the SPEC (https://w3c.github.io/resource-timing/#sec-resource-timing), we do not properly create PerformanceEntry-s for images that are loaded from the cache. Here is the relevant snippet from the SPEC test:

Resources that are retrieved from relevant application caches or local resources MUST be included as PerformanceResourceTiming objects in the Performance Timeline [PERFORMANCE-TIMELINE-2].

Comment 1

[Vicky Chin [:vchin]]

Can I get more background on this? Was this an oversight on our part or did we have concerns about the SPEC and made a decision not to implement?

smaug: would you know?

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

I don't know about PerformanceEntries.
Given bug 822480, Valentin might know.

Comment 3

[Valentin Gosu [:valentin] (he/him)]

This is a known bug. I have a patch in bug 1113676 but unfortunately it also causes some tests to fail - sometimes the entry appears twice in the list. I haven't had time recently to figure it out, so help is appreciated.