Pixels on the TV do not work evenly and slowly. Is this the norm or marriage?

Question

TVs

Hello! Bought a TV. I'm checking everything now and everything seems to be good, but on gray grids the pixels do not turn on at the same time and always in different ways with a different pattern of artifacts. This is fine? Photo grids in the application. There is no such thing on the color scheme.

Now, if you change them among themselves, then the pattern of these grids rises slowly and not evenly on the screen. Is this the norm? Samsung TV