When you create an effect using a line like the above line, you are actually creating an array of pixels, like the following figure, and you can assign the specific values a, b, and c to each pixel.

When you set the speed to 50, it means that the values of all pixels should be read in order and affect the object.

A speed equal to 51 means that only one pixel is read out of every two pixels.

A speed equal to 55 means that only one pixel is read out of every 6 pixels.

As you can see, for speeds greater than 50, only one is read out of several values. Since this code is smart and only savesthe changes, we use the step option to equal the values that only one of them was read to avoid saving duplicate values automatically and reducing the effect size. Always increase the step value to a level where the quality is acceptable.