Would creating two separate parts or one large part be better optimised?

I’m currently creating a game where I have buildings with opaque windows, and I’d like to know whether it’d be better for optimization for me to use 1 big part that spans the entire building to create a window or two small parts on either side of the building.

(None of these examples are said buildings btw.)

Example 1 (Two parts):
image

Example 2 (One part):
image

It depends, if you want both ends to have different colors/textures go with example one, else go with example two. If you get Z-Fighting (If both parts have the same size on one axis) then go with example one and DON’T UNION!!!

Although yes I understand that, I’m looking for which way is more optimized rather than which way looks better

Then example two is the most optimal way.

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