1267046 - Choppy scrolling page on retina display

Status: RESOLVED WORKSFORME

(Core :: Panning and Zooming, defect)

Description

[Bram Speeckaert]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Firefox/45.0
Build ID: 20160407164938

Steps to reproduce:

1) Open http://larian.com/forums/ubbthreads.php?ubb=showflat&Number=580880&#Post580880 on a retina display.
2) Try scrolling.


Actual results:

Scrolling was very choppy.


Expected results:

Scrolling should be smooth, as it is in other browsers.

Comment 1

[Kartikaya Gupta (email:[e-mail])]

Do you see any improvement on a Nightly build? We have a different scrolling mechanism on Nightly compared to Release, it should be less janky.

Comment 2

[Bram Speeckaert]

Scrolling is indeed much smoother in Nightly, although some page drawing seems a little delayed (elements appearing after being scrolled onto the screen). I do prefer that to the janky scrolling, though. :)

Comment 3

[Kartikaya Gupta (email:[e-mail])]

Thanks!

(In reply to Bram Speeckaert from comment #2)
> Scrolling is indeed much smoother in Nightly, although some page drawing
> seems a little delayed (elements appearing after being scrolled onto the
> screen).

Yeah, that's a known issue, and the tradeoff with having asynchronous scrolling. We're working on minimizing that 'checkerboarding' but it'll be hard to eliminate it entirely.

Based on this I'm going to close this as WFM. The asynchronous scrolling code is already enabled by default, but is conditional upon the multi-process project (e10s), and so will be released at the same time as that.