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Large number of objects and normal map take forever to load


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I have been trying to render this destruction scene I have been working on, I textured it in substance painter and reimported the maps with no issues. However when I render the scene with the normal map on de destruction pieces, it takes forever just to load the objects.
All the tests have a around a 1:20 minutes render time, the main varying factor being load time spanning from 2:30 mins without normals to 25:10 mins with normals as you can see in the little speadsheet I made.

Ideally I would like to get a correct load time as I dont understand why adding a normal map adds so much to load times, I feel like their is something I missed.

Thank you in advance for your help.

 

image.png.6ab395be1039a7e7e8464d862dfdd6a8.png

 

Some info on the scene

image.thumb.png.0c7674fa22aacdd86cb4b0e2ddfb580d.png

 

 

Render with normals

with_normal.thumb.jpg.22b2f0f305c9d6f9086ff4c42149392a.jpg

 

Render without normals

without_normal.thumb.jpg.e7176890ebbc0369d0a9c4268fc3033a.jpg

 

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