1135697 - Simple SVG animation causes increased CPU usage and poorer rendering performance

Status: UNCONFIRMED

(Core :: SVG, defect)

Description

[Antoine Quint]

Attachment: pulsing-dot.svg

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/600.5.6 (KHTML, like Gecko) Version/8.0.5 Safari/600.5.6

Steps to reproduce:

See the attached SVG file pulsing-dot.svg. Whenever I open this file in Firefox (35.0.1), CPU usage for both WindowServer and Firefox increase significantly. This testcase is reduced, but in the context of a more complex webpage (which I can't attach to this bug), I can get CPU usage to up to 100% of one core, making my MacBook Pro's fans turn on.



Expected results:

I'd expect CPU usage to be reasonable for such a small animation. Certainly both Safari and Chrome are using a lot less CPU for the very same file.

Comment 1

[Jonathan Watt [:jwatt]]

Which version of Firefox is this, and what's your hardware? I'm not seeing any significant CPU usage change when opening the testcase in FF35 on a 2013 MBP.

Comment 2

[Antoine Quint]

MacBook Pro (Retina, 13-inch, Mid 2014) running OS X 10.10.3, Firefox 35.0.1. In case that's relevant, I'm using a scaled resolution at 1680x1050.

Comment 3

[Antoine Quint]

When I toggle display="none" on the root element using the dev tools, and then toggle it again, I can definitely see CPU usage reported by Firefox and WindowServer jump, as reported by Activity Monitor.