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Subject: [Bug 203732] www/firefox: High CPU usage when playing HTML5 video
Date: Tue, 13 Oct 2015 02:03:35 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203732

            Bug ID: 203732
           Summary: www/firefox: High CPU usage when playing HTML5 video
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko@FreeBSD.org
          Reporter: henry.hu.sh@gmail.com
          Assignee: gecko@FreeBSD.org
             Flags: maintainer-feedback?(gecko@FreeBSD.org)

With default firefox 41.0.1,1 and alsa-plugins 1.0.29, firefox has high cpu
usage when playing html5 video.
With an i7-3612QM, firefox uses >130% CPU when playing 720p youtube video.

If I enable BUFSZ_P2 for audio/alsa-plugins, CPU usage reduces to ~50%.
If I switch to other backends for alsa(like pulse), CPU usage also reduces.

Please set the default value of BUFSZ_P2 to "ON" for alsa-plugins, or fix
alsa's oss backend.

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