How do I make 2D Background and platform not lag?

I have a player controlled 2D block which goes left and right. I have added follow camera with lerp so the player block does not lag at all, it is in perfect smooth motion(to my eye). The background and the platform though lag. Looks like they are choppy and skip instead of smooth movements.

(the player is a blue block, the background is a green/red chessboard pattern, the platforms are black outlines on an empty square set up as the ground and a couple in the above, basic platformer setup)

I would like the background and platform to be smooth as well and not to lag, I really have been googling all day for two days but sincerely I do not know what this phenomenon is even called or what to google. Most answers are for camera to character lerp and character lag but that looks smooth and profiler shows everything is running fine.

Any help or education would be greatly appreciated.