This may win for the absolute worst. Some cams lag by 6 seconds. I’ve a group of 6 cams on my local network. Viewing them on my Samsung Tab A it’s near real time. I hear the guys porsche go by and see it on my cam. Meanwhile on my Samsung J3 with the test software the cam is frozen at 07:46 while it’s 09:30 and the clock is not ticking.
/edit
Tested it on two more cams that have different FW with my Samsung J3 Android 7.01
Luckily I had a black cam still on FW 4.9.4.38. When I selected the Hard setting I had immediate response. When I selected the Soft setting it had 10 second video lag.
I then tried it on a cam I had updated a few days ago with FW 4.9.5.28, with the setting on high the video won’t load, on soft it loads immediately but has a 20 second lag.