CPU jumps up past 50% on the System Monitor graph with both g-s-d and
gnome-display-properties (top claims +60% CPU usage for Xorg). I used
glxgears below. I'm not sure how I would test with xrandr. xrandr --auto
just takes a second and there's no spike on the cpu history. By running
xrandr repeatedly maybe there's a slight increase in activity, but
nothing over 50% CPU.

glxgears before and after g-s-d

met...@discourse:~$ glxgears 
get fences failed: -1
param: 6, val: 0
302 frames in 5.0 seconds = 60.187 FPS
301 frames in 5.0 seconds = 60.119 FPS
301 frames in 5.0 seconds = 59.954 FPS
^C
met...@discourse:~$ gnome-settings-daemon --debug --no-daemon &
[1] 9295
<snip>
met...@discourse:~$ glxgears 
get fences failed: -1
param: 6, val: 0
20 frames in 5.3 seconds =  3.771 FPS
17 frames in 5.3 seconds =  3.196 FPS
20 frames in 5.2 seconds =  3.877 FPS

glxgears after gnome-display-properties

met...@discourse:~$ bg 1
[1]+ gnome-display-properties &
met...@discourse:~$ glxgears
get fences failed: -1
param: 6, val: 0
26 frames in 5.2 seconds =  5.017 FPS
34 frames in 5.4 seconds =  6.310 FPS
31 frames in 5.2 seconds =  5.933 FPS

-- 
gnome-settings-daemon and gnome-display-properties slow down xserver when 
external monitor added
https://bugs.launchpad.net/bugs/339228
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