I use DroidCamX too, I don't have any noticeable delay but I have a fairly solid wireless setup (Unifi AP in the same room) and most of the time I just use the

I use DroidCamX too, I don't have any noticeable delay but I have a fairly solid wireless setup (Unifi AP in the same room) and most of the time I just use the USB cable anyway so I can also keep the phone charging