Public bug reported:

Ubuntu Precise with all updates
gtk-vnc: libgtk-vnc-1.0-0  0.5.0-1ubuntu1   
vinagre: 3.3.3-0ubuntu1
xtightvncviewer: 1.3.9-6.2
qemu-kvm: 1.0+noroms-0ubuntu2
Virtual guest with Windows 7 32bit

When using Qemu-kvm to virtualize guests the virt-viewer and vinagre (both 
based on gtk-vnc) are very slow.
The first drawing of a desktop of 1024x768 takes about 5 seconds. The mouse 
behaves very sluggish and you can actually move the mouse faster than 
displayed. When the physical mouse movement stopped the mouse pointer will 
still be moving for several seconds.

Using vncviewer from the xtightvncviewer package does not have this
problem. The initial screen is drawn in less than a second. The mouse
movement is fast.

Unfortunately xtightvncviewer is  no alternative, since the keymaps are
not mapped correctly.

** Affects: gtk-vnc (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/910058

Title:
  gtk-vnc is unusable slow compared to tightvncviewer

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