Hi, I need some help troubleshooting performance issues in my UE5 project. A few days ago I was getting over 60 FPS, but now I’m only seeing around 20–30 FPS even though I haven’t changed any major settings. Here are the issues I’ve noticed:
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Severe Shadow Depths cost
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When I run
stat gpu, Shadow Depths goes over 220 ms. -
I only have a single Directional Light as my light source and very few assets in the level, but the cost is still extremely high.
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Blank map low FPS
- Even if I create a completely blank map, I only get around 30 FPS.
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Non-Nanite Job Overflow issue
- When using non-Nanite meshes, I sometimes get a job overflow error in the logs.
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LOD vs Nanite culling
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If I apply LODs to assets, I get the non-Nanite job overflow issue.
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If I switch them to Nanite, I notice that camera frustum culling doesn’t work — objects behind the camera are still rendered.
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I tested by freezing rendering and looking away: Nanite meshes are still visible behind the camera, while normal LOD meshes cull correctly.
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So in short:
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FPS suddenly dropped massively (from 60+ to 20–30).
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Shadow Depths is unreasonably expensive.
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Blank map still runs poorly.
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Nanite vs LOD culling behavior seems inconsistent.
Any advice or possible fixes would be really appreciated!