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[Lakshminarayanan Seshadri <lnarayanan.seshadri@xxxxxxxxx>]

Just sharing my thoughts for those battling with compiz cpu and/or memory usage on Ubuntu 14.04:
Not only compiz in Ubuntu 14.04/Trusty consumes CPU it was also taking significant  memory of the order of 150M on my low-end hw laptops.
For me Ubuntu 14.04.1+ gnome flashback session with metacity works fine on my low-end hw(2GB RAM+integrated Intel graphics chipset). Also For those on low-end hw laptops pls stay put on Ubuntu 14.04.1.(14.04.3 works better for latest hw)
Hope it helps for those with low-end hw wondering on compiz.

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https://bugs.launchpad.net/bugs/1293384

Title:
  Compiz CPU usage dramatically increased in Ubuntu 14.04

Status in Compiz:
  Triaged
Status in compiz package in Ubuntu:
  Triaged

Bug description:
  It appears that the workload of low-level graphical operations used by
  compiz when, for example, moving windows has increased dramatically
  between Ubuntu 12.04 and Ubuntu 14.04.

  This might not be that visible when using high-end gpus, but should be
  clearly visible when using compiz on llvmpipe and to some-extent
  invalidates the approach of using compiz on top of llvmpipe as a
  fallback when no GPU is available:

  How to reproduce:
  1) Use the unity-3d desktop in Ubuntu 14.04 on top of a non-accelerating Xorg driver like "modesetting". Move windows around. Note peak and average cpu-usage.

  How to verify compiz is the culprit:
  1) copy /usr/bin/compiz from a Ubuntu 12.04 installation. Drop it in as /usr/bin/compiz on 14.04. Reboot. Perform the same window movement. CPU-usage should be substantially lower.

  This problem also affects VMs running on VMware ESX with a software-
  rendering GPU. Window movement becomes sluggish, which suggests that
  even with GPUs, compiz has increased the number of operations required
  to move windows.

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