Ever since I changed to Xubuntu 16.04 there is an annoying behavior when suspending my laptop: it seems like there's a delay so that the network manager can turn off. This causes long suspend and resume time. The new times are 10-15 seconds which are way longer than what I had before...
Anyway, it seems like systemd-inhibit may be responsible for this. The command systemd-inhibit lists the delay before sleep since NetworkManager needs to turn off networks. There's also another inhibitor which blocks completely xfce4 power management.
How can I get rid of the systemd inhibitors? It is possible to disable them somehow?