Unloading active scene async causes huge enlighten lag spike

Unity Engine
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1

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image1095×314 18.6 KB

As you can see here, unloading this scene causes a ridiculously long freeze in my game. A couple things to note:

  • This only happens when I bake any scene’s lighting with realtime GI enabled
  • This happens to all scenes baked with realtime GI enabled, some lag longer than others
  • I am unloading using Addressables.UnloadSceneAsync
2

Hmm. The call tree doesn’t give away much information. Part of the native portion is probably cut off.

A few questions:

  • How big are the scenes you are playing around with?
  • If you make a tiny scene with realtime GI enabled (just a few cubes or something), do you still get a big spike?
  • What kind of machine are you testing on?

For spikes this long you should file a bug report if this is blocking you. It’s difficult to give better advice without access to the project.

If you want to try troubleshooting further yourself, you can often use a native profiler like Very Sleepy to get a better view of what is going on.

3

The scenes aren’t that big. They’re a decently small arena that runs on mobile and PC at 60 FPS constant just fine, the only issue is the unloading. When I make a tiny scene, there is no spike. I’m gonna try debugging by slowly adding in geometry from the original scene, and rebaking as I go. I probably will file a bug report if I don’t get good results from that debugging.

Here’s a picture of it for reference

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image1110×730 79.2 KB

4

I’ve filed a bug report with all the necessary information and the files for my scene isolated in a test project to make it easily reproducible. IN-85410

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