[Bug 203732] www/firefox: High CPU usage when playing HTML5 video when audio/alsa-plugins is built with BUFSZ_P2=off

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203732

--- Comment #14 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Arto Pekkanen from comment #12)
> If I disable XRender, then Firefox would use more CPU whilst X.org would use less.

XRender can be disabled just for web content but not compositing:
layers.use-image-offscreen-surfaces -> true (hidden pref). However, upstream
disabled for both in Firefox 47.

https://bugzilla.mozilla.org/show_bug.cgi?id=1180942#c17
https://bugzilla.mozilla.org/show_bug.cgi?id=1241832#c6

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