This bug was fixed in the package webbrowser-app -
0.23+17.04.20161024.1-0ubuntu1
---
webbrowser-app (0.23+17.04.20161024.1-0ubuntu1) zesty; urgency=medium
[ Andrew Hayzen ]
* Fix for issue where many tabs causes close button to overlap other
tabs (LP: #1473630)
* When page
** Branch linked: lp:~ci-train-bot/webbrowser-app/webbrowser-app-ubuntu-
zesty-2087
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Title:
Scrolling on www.ceskenoviny.cz is very slow
To man
** Branch linked: lp:~phablet-team/webbrowser-app/staging
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Title:
Scrolling on www.ceskenoviny.cz is very slow
To manage notifications about th
** Changed in: webbrowser-app (Ubuntu)
Status: Confirmed => In Progress
** Branch linked: lp:~osomon/webbrowser-app/loadEvent-optimizations
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Another interesting observation with http://www.ceskenoviny.cz/zpravy
/francouzska-justice-obvinila-16letou-divku-z-planovani-teroru/1379685:
as soon as I scroll on this page (by dragging a finger on a phone or
using the mouse scroll wheel on desktop), the contents of the title
element change, so w
> the layout of the chrome/address bar depends too much on the 'loading'
> and 'loadProgress' properties of the webview, causing countless
> binding evaluations and re-layouts for each load event
When loadCommitted events are emitted while scrolling on that page on
ceskenoviny.cz, I have verified
Hmm, just found another page that doesn't work that well in Ubuntu's
browser: https://www.paradoxplaza.com/cities-skylines-deluxe?___store=eu
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Titl
@Olivier Tilloy: Wow, quick and awesome work :), thank you. I would
expect there are other websites affected by this behaviour based on your
observations so if this could be fixed I hope it will not only help to
resolve problems with this specific page but other sites as well.
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I’ve done some profiling on my arale and I’ve found out a few
interesting things:
- there’s an urlChanged handler in NavigationBar.qml¹ that’s triggered
with every load event, and it’s costly
- the loadEvent and titleChanged handlers in Browser.qml² are expensive
too, because they cause updates
In an attempt to nail down what may be the culprit I’ve commented out
chunks of the browser code related to locationBarController and load
events, but that hasn’t made the situation better. When scrolling on
that page, I’m seeing the CPU usage of webbrowser-app skyrocket, so
there’s something wrong
I’m seeing a stream of LoadCommitted events while scrolling on that
page¹. In a simple oxide WebView though (without an address bar or any
chrome), scrolling is almost smooth, so it seems this problem is browser
specific. I’ve also tested with an Ubuntu.Web WebView and a dummy
locationBarController
And a UA override doesn’t seem to make any change.
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Title:
Scrolling on www.ceskenoviny.cz is very slow
To manage notifications about this bug
Also, I see I did not mention Liri web browser - the page works fine
there as well.
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Title:
Scrolling on www.ceskenoviny.cz is very slow, page k
@Olivier Tilloy: Thank you very much for testing this and for planning
the UA override. I have no idea how to do that with my Ubuntu Phone :(.
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Tit
Just got my hands on an android phone, running a recent version of
chrome (52), and I can confirm that scrolling of that same web page
works fine. I’ll test the UA override hypothesis later today.
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@Olivier Tilloy: I've just asked my friend to test this on Android
(Google Chrome) and was told the website (both the links I posted above)
work just fine there, no problems with scrolling at all. I do no longer
poses any Android (or non-Ubuntu) device so I can't test this on my own
unfortunately :
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