Please help me understand performance issues with ISM

Development Rendering
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1

I am using Instanced Static Meshes to create rooms at runtime with Blueprints. A room consists of almost 25 ISM with default material. The ISM is a cube with 8 vertices and Nanite on.

The performance drops to almost zero FPS if I build 25 or more of these rooms. So 25 rooms with 25 ISM that are only 625 ISM.

I am using version 5.5.4 with Windows.

Please can someone shed some light on this situation? Thank you.

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2

Try turning Nanite off, and mark the meshes as Static ( unless they move )

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You might find things also improve if you just make them meshes instead of ISM.

3

Thank you very much for your help. I found the problem, I was spawning a lot more ISM than I thought. Now everything is running smoothly.

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