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[ghomem <1487980@xxxxxxxxxxxxxxxxxx>]

Currently youtube is unusable due to high cpu usage from Xorg:

Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz
Ubuntu 12.04
Firefox 40.0.3

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https://bugs.launchpad.net/bugs/1487980

Title:
  firefox and xorg high cpu usage when render html5

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  What wrong:
  When open in firefox webpage with html5 video
  (any video on youtube.com or site like http://belzen.by/  http://zenrus.ru/)
  you get high cpu usage by xorg and firefox

  Tasks: 230 total,   2 running, 228 sleeping,   0 stopped,   0 zombie
  %Cpu(s): 23,7 us,  6,9 sy,  0,0 ni, 69,3 id,  0,1 wa,  0,0 hi,  0,0 si,  0,0 st
  KiB Mem:   5965988 total,  5640908 used,   325080 free,   606536 buffers
  KiB Swap:  6148092 total,    44676 used,  6103416 free.  2335352 cached Mem

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                                                                          
  16218 root      20   0  510160 155508  82312 R  62,4  2,6  82:31.02 Xorg                                                                                                                                             
  17749 zed       20   0 2866288 621124 121032 S  36,2 10,4 149:36.32 firefox                                                                                                                                          
  17635 zed       20   0 1305816 384248  84996 S   8,0  6,4 135:20.26 thunderbird                                                                                                                                      
  16794 zed        9 -11  521140  11508   8900 S   4,6  0,2   0:41.63 pulseaudio                                                                                                                                       
  16867 zed       20   0 1675388 258500  86848 S   4,0  4,3 133:39.48 compiz           

  bug exist on 2 different PC (14.04.2 and 14.04.3) with mesa or proprietary amd driver .
  if use Chromium browser - all work perfect.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: firefox 40.0+build4-0ubuntu0.14.04.4
  ProcVersionSignature: Ubuntu 3.19.0-26.28~14.04.1-generic 3.19.8-ckt4
  Uname: Linux 3.19.0-26-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.1-0ubuntu3.12
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   zed       16794 F...m pulseaudio
   /dev/snd/controlC0:  zed       16794 F.... pulseaudio
   /dev/snd/controlC1:  zed       16794 F.... pulseaudio
  BuildID: 20150819100600
  Channel: Unavailable
  CurrentDesktop: Unity
  Date: Mon Aug 24 09:37:06 2015
  ExecutablePath: /usr/lib/firefox/firefox
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions:
   English (South Africa) Language Pack - langpack-en-ZA@xxxxxxxxxxxxxxxxxxx
   English (GB) Language Pack - langpack-en-GB@xxxxxxxxxxxxxxxxxxx
   Russian (RU) Language Pack - langpack-ru@xxxxxxxxxxxxxxxxxxx
   Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
  InstallationDate: Installed on 2014-12-02 (264 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  IpRoute:
   default via 10.0.14.104 dev eth0  proto static 
   10.0.12.0/22 dev eth0  proto kernel  scope link  src 10.0.13.5  metric 1 
   192.168.241.0/24 dev zt0  proto kernel  scope link  src 192.168.241.4
  MostRecentCrashID: bp-5f8cd26b-298e-4d12-af4a-72aaf2150707
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=40.0/20150819100600 (In use)
  RelatedPackageVersions:
   totem-mozilla     3.10.1-1ubuntu4
   icedtea-7-plugin  1.5-1ubuntu1
   rhythmbox-mozilla 3.0.2-0ubuntu2
  RunningIncompatibleAddons: True
  SourcePackage: firefox
  SubmittedCrashIDs: bp-5f8cd26b-298e-4d12-af4a-72aaf2150707
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 07/09/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68CDD Ver. F.50
  dmi.board.name: 1726
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 29.38
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68CDDVer.F.50:bd07/09/2014:svnHewlett-Packard:pnHPProBook6540b:pvr:rvnHewlett-Packard:rn1726:rvrKBCVersion29.38:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 6540b
  dmi.sys.vendor: Hewlett-Packard

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