Why would you not turn on GPU instancing on materials?

So, as part of a thing I’m making I’m having to render a very high poly count building, so I’m looking into how I can optimise the rendering performance.

I’ve looked into GPU instancing, and feel like I have a fair understanding of what it does, but I can’t see why you wouldn’t just have it on for all materials?

Because GPU Instancing have a high overhead, you want to turn it on only when it’s really worth it. Like when you have a large amount of the same mesh ( grass for example ).

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Oh I see, thought it might be something like that, Thank you very much :slight_smile: