animation of transform is very slow compared to IE




6 years ago
6 years ago


(Reporter: henryfhchan, Unassigned)


Windows 7

Firefox Tracking Flags

(Not tracked)


(Whiteboard: [parity-ie][needs-profile])



6 years ago
User Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.102 Safari/535.2

Steps to reproduce:

1. Go to
2. Click Login

Actual results:

The animation is jerky (on a Core i3 machine + ATI Raedon 5450).
The animation is done by css3 transforms + css3 animations.

Expected results:

The animation is smooth, as can be seen in IE 9.

Further Information
The speed improves a bit if I scale down and scale up the overlaying div via firebug.  Heuristics on Layers?


6 years ago
Whiteboard: [parity-ie]
This is smooth on my laptop. What's your about:config graphics section say?
Pretty chunky here with Mobile Intel(R) 4 Series Express Chipset Family (latest drivers of course) on Win7 x64. Chrome's a bit better, though I wouldn't call it smoothe either. IE9 is reasonably smooth, though things don't render quite the same as the other two.
Whiteboard: [parity-ie] → [parity-ie][needs-profile]

Comment 3

6 years ago
about:config gfx are all default.
I suppose you meant about:support:

Adapter Description: ATI Radeon HD 5450
Vendor ID1002:  Device ID68f9
Adapter RAM:  512
Adapter Drivers:  aticfx32 aticfx32 aticfx32 atiumdag atidxx32 atiumdva
Driver Version:  8.850.0.0
Driver Date:  4-19-2011
Vendor ID (GPU #2):  000e
Device ID (GPU #2):  000e
Adapter RAM (GPU #2):  Unknown
Adapter Drivers (GPU #2):  Unknown
Driver Version (GPU #2):  7.1.542.0
Driver Date (GPU #2):  5-22-2006
Direct2D Enabled:  true
DirectWrite Enabled:  true (6.1.7601.17563)
ClearType Parameters:  Gamma: 3100 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 400 
WebGL Renderer:  Google Inc. -- ANGLE (ATI Radeon HD 5450) -- OpenGL ES 2.0 (ANGLE
GPU Accelerated Windows:  1/1 Direct3D 10

IE9 is super smooth compared to Nightly and Chrome.

Comment 4

6 years ago
forgot to mention conducted on clean profile.

Comment 5

6 years ago
removal of the box-shadow resulted in perceivable speed-up.
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