Open Bug 1217370 Opened 5 years ago Updated 5 years ago

Fennec: fast scroll swipes sometimes get less momentum than expected


(Firefox for Android :: Toolbar, defect)

Not set




(Reporter: avih, Unassigned)


(Blocks 1 open bug)


(Whiteboard: [content perf])

This one is hard to capture in a video and it also requires going back and forth between the browsers on the same page and do many fast swipes. It's more a feeling than something I could point at concretely.

From my accumulated experience in examining scroll in Fennec and Chrome (on Android), I have a feeling that for fast/very-fast scroll swipes, chrome responds better than Fennec, more specifically that Fennec gets less initial momentum than I'd expect it to from such swipe (and less than chrome with a similar swipe on the same page).

This happens on some sites more than others. Not sure if it's related to pages rendering complexity or page size/length, or both. 

Wild guess - maybe because (slow-ish?) rendering “interferes” with the swipe/momentum registration and interpretation?

For the sake of reference, I'll state the site , but again, it's more a feeling over many sites and many swipes than something which is unique to a single site.

Tested using:
Fennec: Aurora 43.0a2 API11 2015-09-30
Chrome: 39.0.2171.93
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