What is the best resolution setting for a Ramp Texture?

I have some assets I downloaded and they all seem to have 256x1 ramp textures but the "max size" setting is always 1024. I've used this setting on normal textures before, increase to improve texture quality and decrease to improve performance.

Why are these textures set at 1024? Is it laziness? I feel like I should change the max size to 256. Then again I don't know whether Unity automatically does this at the build time, and I don't know whether this would improve performance since they are so small.