How is the DCS-930L connected to the router? Is this a hardwired internet connection, or are you connected via wifi? A weak signal on any wireless connection, either Wifi to your router, or a weak or overloaded 3G or 4G connection to your iphone may result in poor or choppy video.
I'd start by using a wired connection from camera to router, and router to computer (connecting to the camera via its IP address, not mydilnk). This will be the most reliable connection and should produce reasonably good video (however, it may still not be quite as smooth as TV quality), and show you what the camera should do if you have good connections.
A weak wifi connection between camera and router may produce poor video with a low frame rate on all your devices. First, try the camera on wifi with it near the router, with no walls etc. in between. Then, try your camera where you want it installed. If the quality is worse, and there are walls or other objects in between, they may be degrading the signal. You could have something in the walls, like metal, or foil faced insulation, that's blocking the signal.
I have 2 of these cameras. I had to move one of them from where I first placed it, because it didn't seem to be getting a good wifi signal at that location.