[UE4.27] Spine 4.2 in UE Engine Editor Low FPS

Misaki

MarvinECL We're sorry to hear you're having trouble. You seem to have provided links to Google Drive, but we don't have permission to access them. You can either modify the permissions or share the file with us via email: contact@esotericsoftware.com
Please include the URL of this forum thread in the email so we know the context. Then we can take a look at what's wrong.

MarvinECL

Misaki Email sended. Sorry I forget to edit file permission

Misaki

MarvinECL Thank you for sending the UE project file. I was able to open it without any issues, but I was unable to reproduce the FPS drops or lag you described. To confirm, the steps to reproduce the issue would be opening this project, interacting in the viewport, or playing the default level, correct?

I ran the test on a laptop that is not particularly powerful, so I suspect that the cause may lie in your Unreal Engine settings or another aspect of your environment. Could you please check whether that might be the case?

MarvinECL

Misaki

The unreal project setting should be in the zip file. In my PC I just unzip it and open it by unreal engine, and the FPS drops. I don't know which settings need to be checked.
You need to keep 7-8 Spine Actor in the map. Only 1-2 Spine Actor would not trigger the issue.
My PC AMD 3900X with NVIDIA 1050ti only have 8-9 FPS, my co-worker Intel i7-13700 with NVIDIA 4060 only has 20-25FPS.
My PC screenshot
Here is the utrace file ( file permission edited )

Misaki

MarvinECL Thank you for providing the utrace files. We would like to continue investigating the issue, but in my own tests I was seeing approximately 40 FPS. To help clarify this, I have sent you a video showing the test results via email. Please refer to it.

For reference, my laptop is equipped with an Intel i7-11800 and an NVIDIA GeForce RTX 3050 Ti, so its performance should be somewhat lower than your co-worker’s system.

We will update this thread when we find out more.

MarvinECL

Misaki
I found the reason why you can't reproduce the issue: you open the project by the unreal .uproject file instead of Visual Studio. I just tried on my PC and if I open it direct by unreal .uproject file, the lagging disappered.
So to reproduce the problem, you need to right click the unreal .uproject file and click "Generate Visual Studio project files" , and open it by visual studio.
My project has other C++ files, so this creation process is hardly needed.

Misaki

MarvinECL Thank you for checking the details. Following your instructions, I opened the editor through Visual Studio and reviewed the project you provided. I did not encounter any FPS drop during my tests. I have sent you a video of the results via email for your reference.

Given these findings, it seems likely that the FPS issue may be related to your Visual Studio environment. When you have a moment, please check whether any settings or background processes—such as Build or IntelliSense—might be affecting performance.

MarvinECL

Misaki
In your video you use "Development editor" as unreal environment, but my team use "DebugGame Editor" to run the editor. I tried on my PC then found out this is the main reason.
Now I can temporarily change my environment to Development editor, but I hope you can solve it because 4.0 runtime plugin don't have this issue. My team need DebugGame Editor to debug code as development editor would cause Visual Studio Skip some breakpoints.
![

Misaki

MarvinECL I understand the situation. However, spine-ue depends on UE’s rendering API, and the current implementation already follows the specifications as intended. In this case, the behavior you are experiencing appears to result from how UE handles the DebugGame Editor configuration, rather than something we can adjust on our side.
For this reason, we are unfortunately unable to provide a solution.
To obtain accurate and stable performance results, please use the Development Editor configuration when evaluating FPS.

MarvinECL

Misaki
OK I understand, but I still hope you can consider this an low priority issue, as 4.0 unreal runtime performs good in DebugGame Editor.

Mario

Could you try commenting line 66 in spine-ue/Plugins/SpinePlugin/Source/SpinePlugin/Private/SpineSkeletonRendererComponent.cpp

// SetTickGroup(TG_EndPhysics);

And let me know if that fixes the issue for you?

MarvinECL

Mario
No this not solve the issue.
You can try any edit on my upload UE project, just make sure you open it by DebugGame Editor.

Mario

Yeah, I tried, but in DebugGame mode, where EVERYTHING is compiled with debug info and without optimizations, the entire editor is slow. I'm afraid we can't fix that on our end.