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Subject: [Bug 203732] www/firefox: High CPU usage when playing HTML5 video
 when audio/alsa-plugins is built with BUFSZ_P2=off
Date: Sat, 05 Mar 2016 00:15:15 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D203732

--- Comment #12 from Arto Pekkanen <aksyom@gmail.com> ---
(In reply to Jan Beich from comment #9)

Hey I figured out why X.org uses so much CPU %. It is because of the XRender
extension. If I disable XRender, then Firefox would use more CPU whilst X.o=
rg
would use less. Apparently XRender is used to do basic compositioning at
X-server end, and in my situation turning it off solved some of the excessi=
ve
CPU usage.

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