FPS Drop After Update 4.16.3->4.17

Development Programming & Scripting Blueprint
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Two projects are the same, I deleted a few simple models added in 4.17, but the number of frames did not improve, it averaging 20FPS.
And my 4.16 project has 80FPS at start.
The Profile display, such as dynamic shadows, PhysX, update overlaps time, and so on.

I am now moving the new things created in 4.17 back to 4.16, God bless me!

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Have you found a solution for this problem?

3

Can you start the GPU profiling on both versions and post the pic here?
(GPU Profiling | Unreal Engine Documentation)

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4.16

https://i.imgur.com/MCnIhLi.png

4.17

https://i.imgur.com/tOJmY0u.png

5

It seems that SlateUI are taking too much time, try to run it outside the PIE.

Also some people reported it might be related with stereo rendering, can you try to turn it of just to test?

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4.17 with stereo rendering

https://i.imgur.com/Jnf5i00.png

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So, it seems to be Stereo Render issue, right?

I don’t know right now, but some time ago, the staff were looking for info about that problem. May I suggest you to save a copy of that project just in case they need it again?

8

Thank you very much, the problem has been solved, although I do not know how.
Here are my steps :

  1. I did not optimize the SystemSettings in DefaultEngine.ini according to the official recommendation for VR in 4.16(Although I have used this version for some days). Becaushave not yet packaged the project, and the default settings seem OK. I migrated my project into the
  2. 4.17(due to the WidgetInteractionComponent problem) because I tried to package the project, so I set up the DefaultEngine.ini, and then there is no frame drop in 4.17.
  3. But the same setting(official recommendation for VR) I copy to 4.16 it will cause frame drop(means it cause the frame drop problem in 4.16 but solve the same problem in 4.17).
  4. Anyway, the problem has been resolved now, thank you all. But I can definitely say the problem is not fixed by 4.17.2 update because I have tested it.

The setting is as follows:

[SystemSettings]
r.VolumeMultiplier=1.0
r.screenpercentage=130
r.SeparateTranslucency=0
r.HZBOcclusion=0
r.FinishCurrentFrame=1
r.MotionBlurQuality=0
r.PostProcessAAQuality=3
r.BloomQuality=1
r.EyeAdaptationQuality=0
r.AmbientOcclusionLevels=0
r.SSR.Quality=1
r.DepthOfFieldQuality=0
r.SceneColorFormat=2
r.SSSSS=0
r.TranslucencyVolumeBlur=0
r.TranslucencyLightingVolumeDim=4
r.MaxAnisotropy=8
r.LensFlareQuality=0
r.SceneColorFringeQuality=0
r.FastBlurThreshold=0
r.SSR.MaxRoughness=0.1
r.compileshadersfordevelopment=0
r.rhicmdbypass=0
r.TiledReflectionEnvironmentMinimumCount=10