The service netmount that starts NetworkManager causes a ~30 sec freeze of the screen and any input immediately after boot. I know for sure because I deleted the service from the default runlevel and upon rebooting, the freeze didn’t happen, and when I started it manually, the freeze happened. The following was the output:
* Starting NetworkManager ... [ ok ] Connecting............... 0s [offline] * Marking NetworkManager as inactive. It will automatically be marked * as started after a network connection has been established. * WARNING: NetworkManager has started, but is inactive * WARNING: netmount will start when NetworkManager has started
EDIT: It is no longer reproducible; it is intermittent.