Efficient way to have different color on only 1 side of a Part

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#1

Hello
What is the most efficient (from performance point of view) way to create parts having only 1 of their sides in different color?
Should I split each Part to 2 parts and color them differently?
Or should I add texture to the side which I want to be colored differently?
or there is a better way?

Thank you

#2

Either a texture or a SurfaceGui (Size set to 1, 0, 1, 0) and Frame isnde it (Size set to 1, 0, 1, 0).

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#3

just upload a decal with that colorand kaboom.

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