Will a mesh with a "invisible" material be rendered?

So I got this mesh built up of different parts, and the quickfix I’ve used so far is to just assign a invisible material to the parts that I want to hide.

My question is, are these parts still rendered? Does it affect performance, and would it be worth going into a 3d software and just remove them.

I assume they do affect performance, but just to be sure I figured I’d ask here :slight_smile:

Thanks!

The answers to three questions are yes, yes and yes.

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