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Fixed in Unity 2018.1



Found in


Issue ID




BuildPipelineInterfaces causes slow EnterPlaymode performance when there are many cs files in the project

Build Pipeline



Priority: 7Not yet prioritized for a release


Severity: 3Secondary functionality broken

Reproduction Steps:
1. Import attached project.
2. Create new scene.
3. In Profiler, select Record and Profile Editor.
4. Enter Play mode.
5. Stop recording in Profiler.
6. In Profiler Overview, find:
EnterPlaymode -> Application.WaitForAsyncOperationToComplete -> Preload Single Step -> Application.LoadLevelAsync Integrate -> BuildPipelineIntefaces.InitializeBuildCallbacks()
7. Observe Time ms.

Expected result: BuildPipelineIntefaces.InitializeBuildCallbacks() should not make a new scene this slow.
Actual result: BuildPipelineIntefaces.InitializeBuildCallbacks() slows down Play mode. Time ms becomes much shorter only when all cs files are deleted.

Reproducible with: 5.6.2p3, 2017.1.0p1, 2017.2.0b3, 2017.3.0a1
Not reproducible with: 5.5.4f1


Already fixed in: 2018.1.0b10, 2017.2.0p1, 2017.1.2p2. Fixes on other versions will appear a little later

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