In many smart TVs, when you press the input button, it doesn't immediately pop up a mini OSD. It loads a program that can take as long as it does to load a streaming service's app. This program shows you ads, sometimes even inserts ads for streaming services in between the input sources you have to click over. This is before the time it actually takes for the input to change. With my TV, if I am on TV/Antenna, it takes me about 10 seconds from the time I first press the input button to when I can press the OK button on HDMI 4 which sends the command to switch inputs. The actual switching of the input takes about 1 second.