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It's never been a better time to switch to Firefox
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Could be but I don't think so in this case. It seems (based on no evidence - purely feel) that there's some kind of event listener being triggered every time the page scrolls (whether this be touch/scroll event, visible contents, etc idk) and this event listener has different optimisation or performance characteristics depending on the device and rendering engine.