854100 - Firefox is laggy when wiping the background on http://www.battlefield.com/battlefield-4

Status: UNCONFIRMED

(Core :: DOM: Core & HTML, defect, P5)

Description

[John Drinkwater (:beta)]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:22.0) Gecko/20130322 Firefox/22.0
Build ID: 20130322031028

Steps to reproduce:

Visit the http://www.battlefield.com/battlefield-4 site for the reveal of Battlefield 4.
They have an interesting background which is a window above an image, the user swipes the cursor across the page to reveal whats behind, for the condensation to return after a time…
The animation isn’t as smooth as it could be, with Chromium 25 performing better.

Need to investigate if this is a Firefox issue or how they have coded the behaviour to prefer webkit/v8.

Comment 1

[John Drinkwater (:beta)]

Attachment: ‘minimal’ testcase

Site is closing soon, so keep a pared* down version as a test case.
Depends on jQuery from googleapis.com and two images on battlefield.com

*for whatever minimal is accepted, HTML is bare-bones, JS is scarily wasteful but likely a chunk of the perf issue.

Comment 2

[John Drinkwater (:beta)]

Captured a profile of this http://people.mozilla.com/~bgirard/cleopatra/#report=717064f260fbad4fc62c5aef51e543ff9551ea91 lulls in graph is where I am pausing the mouse cursor for a few seconds to allow the swipe to fade and just to make the sampling clearer. Is this capturing useful info?

Comment 3

[:Gijs (out for now; he/him)]

Mixed content blocking breaks this testcase... do you know if this is still an issue?

Comment 4

[John Drinkwater (:beta)]

On the most recent Nightly, yes, it still has jank.

https://github.com/johndrinkwater/battlefield-test-case should have all the files to run locally

Comment 5

[Olli Pettay [:smaug][[e-mail]]]

I can't reproduce using 64-linux-nightly

Comment 6

[John Drinkwater (:beta)]

Still there for me in Nightly 2013-08-26; Chrome still performs better in responsiveness and smoothness of drawing. Tried with OMTC about:config flags which improves the smoothness of animation and doesnt have the sudden pauses but latency is much worse - mouse cursor can be ahead by ~100 pixels

Adapter Description	NVIDIA Corporation -- GeForce GT 630/PCIe/SSE2
Device ID	GeForce GT 630/PCIe/SSE2
Driver Version	4.3.0 NVIDIA 325.08
GPU Accelerated Windows	0/1 Basic
windowLayerManagerRemote	false
AzureCanvasBackend	cairo
AzureContentBackend	none
AzureFallbackCanvasBackend	none
AzureSkiaAccelerated	0

Comment 7

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046

Move all DOM bugs that haven’t been updated in more than 3 years and has no one currently assigned to P5.

If you have questions, please contact :mdaly.