It's got something to do with the kernel. Done a quick test using the
latest kernel 4.4.0-42-generic. Restarted my pc and logged in. Opened
terminal and mem usage was 1.8gb.

Done the same with the latest 4.8.1 kernel from ubuntu kernels page and
the usage was only 673mb.


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  Ubuntu 16.04 Unity desktop uses much more ram than Ubuntu 15.10

Status in linux package in Ubuntu:
Status in linux source package in Xenial:

Bug description:
  Ubuntu 16.04 64bit ISO number 20160420.1
  unity version 7.4.0+16.04.20160415-0ubuntu1
  Ubuntu 16.04 64bit ram usage has increase dramatically over Ubuntu 15.10
  Ubuntu 16.04 ram roughly 1 GB Ubuntu15.10 can be tuned to 420, 450 MB
  Ubuntu 16.04 with unity uses 1GB whereas Kubuntu 16.04 is using 420MB live usb

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: unity 7.4.0+16.04.20160415-0ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CasperVersion: 1.376
  CompizPlugins: No value set for 
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Thu Apr 21 01:44:22 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
   Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics 
Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Xeon E3-1200 v3/4th Gen Core Processor 
Integrated Graphics Controller [1043:8534]
   b'org.compiz.core' b'outputs' b"['1920x1080+0+0']"
   b'org.compiz.core' b'active-plugins' b"['core', 'composite', 'opengl', 
'place', 'regex', 'resize', 'session', 'snap', 'vpswitch', 'wall', 'animation', 
'commands', 'compiztoolbox', 'copytex', 'fade', 'grid', 'imgpng', 'mousepoll', 
'move', 'scale', 'unitymtgrabhandles', 'workarounds', 'expo', 'ezoom', 
   b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
   b'org.gnome.desktop.interface' b'scaling-factor' b'uint32 1'
  LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  MachineType: ASUS All Series
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi 
file=/cdrom/preseed/username.seed boot=casper quiet splash --- 
cdrom-detect/try-usb=true noprompt
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install) 06/03/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2004
  dmi.board.asset.tag: To be filled by O.E.M. Z87-PLUS
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
dmi:bvnAmericanMegatrendsInc.:bvr2004:bd06/03/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ87-PLUS:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS
  version.compiz: compiz 1:
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
  xserver.bootTime: Thu Apr 21 01:37:17 2016
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.3-1ubuntu2

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