1002181 - [Flatfish][Browser][Email] When scrolling, page content disappears

Status: RESOLVED WONTFIX

(Firefox OS Graveyard :: Gaia::Browser, defect)

Description

[Richard Pappalardo [:rpapa][:rpappalardo]]

When scrolling on web pages, content disappears and only thing visible is white background.  Especially when quickly scrolling long pages, content can be invisible for upwards of 4 seconds.  When this happens, one begins to wonder if the browser has stopped working.

Comment 1

[cyke64]

I can't reproduce the issue described if you don't give me some URL to try !

Comment 2

[Richard Pappalardo [:rpapa][:rpappalardo]]

(In reply to cyke64 from comment #1)
> I can't reproduce the issue described if you don't give me some URL to try !

Sure, the easiest place to see this issue is on long pages like this one:
https://raw.githubusercontent.com/mozilla-b2g/gaia/master/Makefile

Try scrolling rapidly.  You will notice that either the lower half of the page will "white out" while rendering or the entire page will white out if you scroll 2-3 times back-to-back with your finder.

These kinds of artifacts seems to all be performance related.  I also noticed other artifacts like page "freezing" and temporary "black" pages as if the device is trying to catch up.  The Flame doesn't manifest any of these artifacts in the browser, so I'm assuming it has adequate power to handle changes better.

Comment 3

[Richard Pappalardo [:rpapa][:rpappalardo]]

Posted a short video on Dropbox demoing the artifact:
https://www.dropbox.com/s/mt5c1txe1794v5d/2014-05-11%2012.13.37.mov

Comment 4

[Caspy7]

I have a Flatfish device as well.
When using the demo URL, my experience matches that of the video.

Comment 5

[Richard Pappalardo [:rpapa][:rpappalardo]]

I've noticed a similar artifact when using email.  Rather than this being a browser issue, could it be a generalized performance issue with non-optimized caching on any app that has a long stream of data to render?  This seriously detracts from the user experience in that it makes the device appear sluggish overall.  I have not seen such behavior on the Flame device so, of course, hardware may be the limiting factor here, but clearly some optimization needs to happen.  I'm sure the Tarako has even less power than the Flatfish.