Hello,
I’m wondering if it’s possible to only render what the camera sees, to save perfomance.
The occlusion is not working very well.
Is there any other things that can be used?
Best Regards,
Léon
Well good news this is already the case 
By default Babylon.js will do a frustum clipping i.e. removing all meshes not visible by the camera 
You can even control how this is done: Optimizing Your Scene | Babylon.js Documentation (babylonjs.com)
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