Noise issue UE5

SOLVED : The problem was coming from Nanite, we had enable it on the static meshes on the scene but even after having disable it, the noise was not going away, we had to re import the static meshes and the problem was gone.

UE 5.0.3
Hi,

We have an issue with a lot of noise in our scene.

I tried switching from DX12 to DX11 with no success, we are using a planar reflection for a mirror in the scene so we had to change the project settings as following :

Support for global clip plane for plane reflection is checked,
Reflection method is set to lumen
Dynamic global illumination is set to screen space
Motion blur is off

The scene and its material have been made in blender, the previous version had some little noise, not that much visible but we had to change it following client modifications and now we have a tremendous amount of noise in the scene. Could it be because of the material and textures coming from blender ?

Thanks

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