Fading multiple objects

Hello, How to implement fading of multiple objects depending on the trigger enter? Example: there is a wall consists of 150 cubes in length and 150 cubes in height, when object with sphere trigger passes through this wall, cubes which were touched should smoothly disappear, and then smoothly appear. I decided to use color lerp, for this, but I heard that it’s horrible for performance especially for Mobile devices, moreover I’m planning to spawn multiple objects to multiple walls , and there will be a lot of fading objects