Description of problem:

Using virt-manager through a slow link makes it really difficult to use the VNC console of KVM/qemu guests. The problem seems to be that virt-manger doesn't attempt to use lossy encoding.
This is also true for virt-viewer.

It'd be great to have an option to reduce the quality so we can use it remotely.



Version-Release number of selected component (if applicable):
virt-manager 0.8
libvirt 0.7.0
qemu-kvm 0.10.6

How reproducible:
Always.

Steps to Reproduce:
1. connect to a remote libvirt over a slow link (~300 or 400kbps)
2. open a guest console
3. see how slow it is
  
Actual results:
Image quality is perfect, but refresh rate is so slow that it's nearly impossible to use

Expected results:
Image quality and colour depth should be reduced when we use slow links.

Additional info:
If automatic selection of the best encoding/colour depth depending on the available bandwidth would really great, we could start with some fixed preset somewhere where we could choose:

- High quality
- Medium quality
- Low quality

either on a per connection basis, or a per guest basis.