Looks much better.
$ time uvt-simplestreams-libvirt sync
real 6m24.381s user 1m7.168s sys 1m27.080s
$ sudo apt-get install python-simplestreams/xenial-proposed ... Unpacking python-simplestreams (0.1.0~bzr426-0ubuntu1.1) over (0.1.0~bzr426-0ubuntu1) ... Setting up python-simplestreams (0.1.0~bzr426-0ubuntu1.1) ...
real 0m2.743s user 0m0.356s sys 0m0.032s
Looks much better.
$ time uvt-simplestrea ms-libvirt sync
real 6m24.381s
user 1m7.168s
sys 1m27.080s
$ sudo apt-get install python- simplestreams/ xenial- proposed simplestreams (0.1.0~ bzr426- 0ubuntu1. 1) over (0.1.0~ bzr426- 0ubuntu1) ... simplestreams (0.1.0~ bzr426- 0ubuntu1. 1) ...
...
Unpacking python-
Setting up python-
$ time uvt-simplestrea ms-libvirt sync
real 0m2.743s
user 0m0.356s
sys 0m0.032s