A photo of the Nikon Wireless Mobile Utility (which allows an owner of certain Nikon cameras to stream live view and take a photo from the app), as running on my Huawei P9 Android phone, taken with the app.
Especially note the slight amount of lag, visible in the fact that the view of the app within the app has my finger still on the button, but the view of the app itself doesn't (and my finger is even completely out of the frame). It takes about half a second for the photo to be taken, and slightly longer than that for data to stream in from the camera to the phone, which I don't think is too bad.
In landscape orientation, the bottom right shows the previous photo that was taken (in portrait, the bottom of the screen shows several). You'll note that this was not my first attempt ;-)
Also note that the wifi logo shows that there is no Internet connection through the wifi. This is because the phone is connected to the camera over wifi, and obviously the camera has no Internet uplink...