Very low FPS

General Feedback & Requests
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1

I’m quite new to unreal but I’ve downloaded ue5 and even an empty level with just a player start is only giving me around 20 FPS, in ue4 a simple small level I get 120fps, using ue5 I can see my gpu is at 100% via task manager. Is this a bug or just not a good enough gpu? I’ve got a rx 570

2

Luman defaults to on and runs in software mode if you don’t have RTX.

3

So would I need to upgrade gpu or cpu? I tried turning off lumen and it made little difference

4

I also have an RX 570. And I also get very low FPS.
In a test scene in UE4 with high-poly stones from Quixel, I have 160 FPS.
In UE5, if I turn off the new features of Nanite (for static mesh) and Virtual Shadow Maps, I have 94 FPS.
If I turn on Nanite and don’t turn on Virtual Shadow Maps, I have 110 fps.
If I turn on Nanite and turn on Virtual Shadow Maps I have 35 fps.
Lumen was always off.

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5

Look this, and also look the fps counter: Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.

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6

I also get 120 FPS in a UE4 project and far less FPS (Around 45) in a UE5 project

7

You can also turn off the new project setting Temporal Super Resolution to improve performance.

r.nanite 0 in the console can give you a tiny performance increase if the scene does not have any Nanite meshes.

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8

Interesting. If I do r.nanite 0 fps increases from 110 to 260. But in UE4 the fps is higher.

9

I haven’t seen much difference between UE4 and UE5 performance wise. I am using a 3900X and 3090 RTX. Lumen and Nanite both on. The Ancient demo PIE runs a little low FPS, that is to be expected I guess with their recommended settings.

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10

With an RTX 2080 and i7-9700K the difference is huge between UE4 and UE5 with default settings: 250 vs 75 fps.

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11

I had some big luck yesterday and won a rtx 3060, when it arrives and I install it, I will post back with the difference the new gpu made.

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12

Awesome, rarely do I hear people actually winning awesome gear.

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13

Yo that’s badass. Congrats

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14

r.nanite 0 gave me pretty massive performance gains. I don’t think I was using Nanite so I’m not sure why It did.

15

Ok so my 3060 arrived and I just installed it, I’m now seeing around 45 FPS which is still low but probably being bottlenecked from motherboard and cpu too, it’s still double what I did have though

16

I have a i9-9900K (@5ghz) with an RTX 3090 and the Collab Viewer base project runs around 60-70 fps. Wtf is that all about?

17

Anyone figure out why disabling Nanite gives a boost? isn’t it supposed to be the opposite?

3 Likes
18

In post 10 of the initial post Lumen GI and Reflections feedback thread - Development Discussion / Unreal Engine 5 Early Access - Unreal Engine Forums the instruction was given

Lumen’s use of ray-traced direct lighting is tied to the use of ray-traced shadows in the scene. You can decouple this by setting the following CVar:
r.Lumen.DirectLighting.HardwareRayTracing 0

However, you might opt to work without ray-traced shadows, since virtual shadow maps are the preferred method to use with Nanite assets.

19

I’ve tried all these methods, i’m getting 24fps in UE5 and 140fps in UE4.

Ryzen 9 3950X 16-core, 64gb RAM, SSD, (Purposely running on a GTX 1060 OC 6gb)

2 Likes
20

It is very strange, I actually want to use Nanite and Lumen, but if disabling them, is such a great solution, I think I’ll stay with dynamic lights and LOD’s for a while, sadly

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