I have a project with 4 objects in the scene. The total face count is 46,594. The viewport shading is set to Solid mode. Yet, my memory usage is at 15 GB. I've applied the multires modifier on 2 objects with the viewport level at 0. At 1, the memory usage goes up to 32 GB.

What am I doing wrong ?

My specs: I7 3930k 32GB RAM Gtx 980ti

File Link: https://drive.google.com/file/d/1XmkH0xof6VzGU1cBndevUEKt3V8VWCoS/view?usp=share_link

  • $\begingroup$ Also I'm noticing that in edit mode, as I select faces of an object, the memory usage increases exponentially. Almost 1 GB per tiny face selected. Is this normal ? $\endgroup$ Dec 6, 2022 at 7:14
  • $\begingroup$ Hey! Could you pack your Blend.file and upload it to blend-exchange.com please :) $\endgroup$ Dec 6, 2022 at 8:20
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    $\begingroup$ 1.2GB is quiete large, what exactly causes this large of a file if you only have 4 Objects with just 46k faces? You can try to make a copy file and strip everything that does not impact the lagging and upload it $\endgroup$ Dec 6, 2022 at 8:30
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    $\begingroup$ Hi. Please don't post essential information like links, file downloads or additional details in the comments section where it can be easily missed. Instead edit them into your original post with the Edit button above. Comments are transitory by nature, are hard to index or search for, and may be erased at any moment. $\endgroup$ Dec 6, 2022 at 10:35
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    $\begingroup$ The file is really huge for the little meshes you have in there. I've extracted the textures. That's about 185 MB. So the remaining blend file is still 1 GB big. It looks like the two MultiRes modifiers eat 850 MB for breakfast. If the modifiers are applied (or removed) then the file size drops to 150 MB with 1.1 million vertices. I've expected something around 60-90 MB. Well, ok. But 850 MB doesn't look right, it looks like a memory leak or bug. Tested with Blender 3.4.0b. Maybe you can drop the file size if you apply new MultRes modifiers + "ShrinkWrap-copy" the original mesh. $\endgroup$
    – Blunder
    Dec 7, 2022 at 10:29


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