The spice-html5 does not support the qxl drivers for Windows VMs and it looks like qxl has the best performance for now.

While spice-html5 is more like proof-of-concept, a bit slow and in general not really supported right now.

On the other hand, spice-web-client is performant, production solution and supports almost everything the spice can support.

The pull request is mostly the drop-in replacement, spice-html5 web client JavaScript gets replaced with spice-web-client JavaScript.

I used the latest version of spice-web-client from github: https://github.com/eyeos/spice-web-client - unfortunately guys don't have releases in CDN.