Open Bug 1382239 Opened 3 years ago Updated 2 years ago

Add telemetry to measure how often an already loaded image is not visible on the screen.

Categories

(Core :: ImageLib, enhancement, P5)

enhancement

Tracking

()

Tracking Status
firefox57 --- wontfix

People

(Reporter: mayhemer, Unassigned)

References

(Blocks 1 open bug)

Details

(Whiteboard: [gfx-noted])

Based on https://bugzilla.mozilla.org/show_bug.cgi?id=1381084#c3 I think we need to step back and figure out if there are some ways worth trying to set network load priorities early enough on image loads.

I think an interesting metric could be to figure out how many images that end up not rendered in the view port are loaded (onstoprequest) BEFORE images that do.  If it's a negligible amount (because on modern sites <img> presence in the markup somewhat reflects screen priority - from top to bottom), I don't think we need to do any deeper optimizations.
Whiteboard: [gfx-noted]
I have some different testing plans (more local-analytical), hence a wide deployed telemetry is not urgent to have soon.
Priority: P1 → P3
Priority: P3 → P5
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