Thomas, one thing you can do to disable some of the unity effects when not
running on sw-renderer, is to run unity with:
COMPIZ_CONFIG_PROFILE=ubuntu UNITY_LOW_GFX_MODE=1 compiz --replace
Other optimizations we could do in that case are:
1) Disabling the compiz live-resize (it shouldn't affect movement btw)
2) Reduce the decorations shadows radius
You can actually try to see if these aspects might affect you without any code
changes, but just hacking on compiz settings with:
a) install compizconfig-settings-manager
b) run ccsm and change these settings:
To verify (1): resize plugin → General → Resize mode: Rectangle
To verify (2): unity plugin → Decorations → Override Theme Settings:
checked (then hack on config)
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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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/compiz/+bug/1293384/+subscriptions
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