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Votes

2

Found in

2022.3.5f1

2023.1.4f1

2023.2.0a23

Issue ID

UUM-42837

Regression

Yes

Performance drops when using a lot of Audio Sources

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Reproduction steps:
1. Open the attached project “AudioSourcePerformance“
2. Open the Scene “Assets/Scenes/SampleScene“
3. In the Game View press the “Stats” button
4. Enter the Play Mode
5. Press the button “Play All”
6. Observe the Statistics window

Expected result: The Scene is running without performance issues
Actual result: The running Scene has a low frame rate, high DSP load, CPU usage is high

Reproducible with: 2022.1.0a5, 2022.3.5f1, 2023.1.4f1, 2023.2.0a23
Not reproducible with: 2021.3.28f1, 2022.1.0a2
Couldn't test with: 2022.1.0a3, 2022.1.0a4 (Unity crashes when trying to enter the Play Mode)

Reproducible on: Windows 11

  1. Resolution Note:

    Thank you for bringing this to our attention, we can verify that there is indeed a performance hit in this case.

    Going into 2022.2 we modified the audibility system internally so that it would work with send/receive on mixers. This modification gets quite expensive when the underlying audio graph is large (as is the case with this issue). We have plans internally to re-work the audibility system so that it is more performant, but it is sadly not a quick fix as this part of the audio system is complex - so any changes come with a high amount of risk.

    If at all possible we recommend trying to lower the audio source count (2500 is pushing the audio system very far!) as well as lowering the voice limits from their maximum.

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Comments (3)

  1. egert523

    Oct 17, 2023 19:46

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  2. bfoddy

    Aug 09, 2023 15:27

    Massive downgrade from 2021.3, wish this had been documented at all because it's a pretty major hassle for us to roll back. Burned again!

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