Is reuse material function optimize?

Development Rendering
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1

Hello
I know than material instance don’t optimise, it’s just easier way to manage materials, but concerning material function, if I reuse the same material function in many material I do optmization?
My material function is calculated one time then send to all materials, or recalculated each time in each material?

Thanks

2

It just makes things neater, it doesn’t optimize.

The function needs to be calculated separately for each material.