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Postponed means that the issue was either a feature request or something that requires major refactoring on our side. Since that makes the issue not actionable in the close future we choose to close it as Postponed and add it on our internal roadmaps and technical debt pages instead.


Fixed in 2019.4.X, 2020.3.X, 2021.1.X, 2021.2.X



Found in







Issue ID




Poor performance when loading or unloading a large Scene



Reproduction steps:
1. Open the attached project ""
2. Open "Loader.unity" Scene
3. Enter Play Mode
4. Click "Load Heavy Scene" in the bottom left corner to load
5. Observe "time" to load in the bottom right corner.
6. Click "Load Heavy Scene" again to unload
7. Observe "time" to unload in the bottom right.

Expected result: The Scene loading and unloading time is similar to previous Editor versions
Actual result: The Scene loading and unloading time is slower than previous Editor versions

Reproducible with: 2019.4.29f1, 2020.3.17f1, 2021.1.17f1, 2021.2.0b9, 2022.1.0a6
Not reproducible with: 2019.4.28f1

  1. Resolution Note (2022.1.X):

    This issue will be investigated further as part of our Domain Reload performance improvement as we are aware about the parts that could be further causing it. Will be closing this as the original source of the regression was fixed.

Comments (2)

  1. Wawruch2

    May 18, 2022 17:09

    Same, it can take like 20-30minutes to load this amount of transforms, meanwhile older versions are doing it in like 10-20seconds. Going into playmode also takes 20-30minutes, sometimes it just freezes without going into playmode

  2. tkslan

    May 18, 2022 15:20

    Hi, we have similar issue.
    Heavy scene, loads of props (~60k) . Loads fast on 2021.3, on 2022.1 it take a few minutes.
    Removing 10k props speeds up loading times, but still no compare to previous Unity versions.

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