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[Launchpad Bug Tracker <1566157@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package metacity - 1:3.18.4-1ubuntu1

---------------
metacity (1:3.18.4-1ubuntu1) yakkety; urgency=medium

  * Merge with Debian unstable, remaining changes:
    - debian/metacity-common.links: Show keybindings in Unity control center.
    - debian/metacity-common.gsettings-override: Change the default theme to
      Ambiance.
  * Drop all patches, applied upstream.
  * The new release fixes LP: #1566157, #1573478.

 -- Dmitry Shachnev <mitya57@xxxxxxxxxx>  Tue, 26 Apr 2016 14:21:16
+0300

** Changed in: metacity (Ubuntu Yakkety)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1566157

Title:
  Metacity's compositing is too slow

Status in metacity package in Ubuntu:
  Fix Released
Status in metacity source package in Xenial:
  Fix Committed
Status in metacity source package in Yakkety:
  Fix Released

Bug description:
  [Impact]
  Metacity's performance is about 2 times slower than it was in 14.04 version. It is a regression from previous LTS and impacts users with slow hardware.

  [Test Case]
  Run some performance checker like x11perf or glmark2, see the reporter's comments below for detailed info.

  [Regression Potential]
  This fix is tested by several users and seems to not have any regressions.

  -----------------------------------------------------------------------------
  I did the following benchmarks between `metacity --no-composite`, `metacity --composite`, and `compiz`, in Ubuntu 16.04.

  First, I disabled vsync:
  $ cat ~/.drirc
  <device screen="0" driver="dri2">
      <application name="Default">
              <option name="vblank_mode" value="0"/>
      </application>
  </device>

  Then I ran glxgears as follows:

  $ metacity --no-composite --replace & sleep 5 && glxgears & sleep 20 && killall glxgears
  29564 frames in 5.0 seconds = 5912.721 FPS
  29729 frames in 5.0 seconds = 5945.777 FPS

  $ metacity --composite --replace & sleep 5 && glxgears & sleep 20 && killall glxgears
  10366 frames in 5.0 seconds = 2073.057 FPS
  10194 frames in 5.0 seconds = 2038.702 FPS

  $ compiz --replace & sleep 5 && glxgears & sleep 20 && killall glxgears
  37633 frames in 5.0 seconds = 7522.813 FPS
  37990 frames in 5.0 seconds = 7597.965 FPS

  As a second set of benchmarks, I ran glxgears -fullscreen as follows:

  $ metacity --no-composite --replace & sleep 5 && glxgears -fullscreen & sleep 20 && killall glxgears
  1652 frames in 5.0 seconds = 330.296 FPS
  1667 frames in 5.0 seconds = 333.281 FPS

  $ metacity --composite --replace & sleep 5 && glxgears -fullscreen & sleep 20 && killall glxgears
  886 frames in 5.0 seconds = 177.007 FPS
  891 frames in 5.0 seconds = 178.099 FPS

  $ compiz --replace & sleep 5 && glxgears -fullscreen & sleep 20 && killall glxgears
  1830 frames in 5.0 seconds = 365.868 FPS
  1847 frames in 5.0 seconds = 369.242 FPS

  Normalized results (with compiz=100):
  ================================
  Windowed:
  metacity --no-composite: 78 FPS
  metacity --composite: 27 FPS
  compiz: 100 FPS

  Full screen:
  metacity --no-composite: 90 FPS
  metacity --composite: 48 FPS
  compiz: 100 FPS

  So `metacity --composite` in this test was about 2 times slower than
  `metacity --no-composite` and about 3 times slower than `compiz`.

  This test was done an "Intel(R) Core(TM) i5-4440 CPU @ 3.10GHz" CPU, with the following embedded graphics card:
  $ lspci -nn -k | grep -A 2 VGA
  00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06)
   Subsystem: Gigabyte Technology Co., Ltd Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [1458:d000]
   Kernel driver in use: i915

  I'll upload more tests if I find anything newsworthy.

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