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Fixed in 2023.1.0a10



Found in


Issue ID




TerrainData.AwakeFromLoad takes around 13-19 ms after loading a Terrain from an asset bundle



How to reproduce:
1. Open the attached project ("")
2. Open Profiler if it's not open (Ctrl/command + 7)
3. Enter Play Mode, wait for the terrain to load, and exit Play Mode
4. In the Profiler hierarchy view search for the keyword "TerrainData.AwakeFromLoad" in the first few frames of the Profiler data

Expected result: TerrainData.AwakeFromLoad does not take 13-19 ms of time
Actual result: TerrainData.AwakeFromLoad takes 13-19 ms of time

Reproducible with: 2020.2.0b10, 2020.3.26f1
Not reproducible with: 2019.4.34f1, 2020.2.0b9, 2021.2.8f1, 2022.1.0b4, 2022.2.0a2

- If you select the Assets/Terrain and change the heightmap resolution of the terrain to 513 * 513, rebuild the asset bundle that contains the terrain asset (I.e. Go to the addressables group window and perform a rebuild there) and repeat steps 1 - 5, the delay for TerrainData.AwakeFromLoad reduces to less than 5 ms.

  1. Resolution Note (fix version 2023.1.0a10):

    The fix reduces the amount of time taken on the main thread to async load a terrain. The physics system still takes some time on the main thread to set up the terrain collider.

Comments (3)

  1. Ormy

    Feb 18, 2023 14:43

    Updated our game from 2019 lts to 2021.3 and load times tripled due to this issue. Will this be fixed in 2021 lts?

  2. sdargiewicz

    Jan 16, 2023 02:06

    Will this fix make it into 2021.3 LTS? 60+ms for TerrainData.AwakeFromLoad

  3. mrc_akka

    Jul 11, 2022 08:00

    Append in 2021.3.

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