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Under Consideration for 1.0.X



Found in [Package]


Issue ID




SequenceAssetIndexer.InitializeWithExistingData adds overhead when entering Play Mode in a heavy project

Package: Sequences


Reproduction Steps:
# Open the attached project
# Enter Play Mode
# Observe delayCall callbacks locking up for a few seconds right after the initial application reload


Expected result: there is no significant overhead from Sequences-related code when entering the play mode

Actual result: SequenceAssetIndexer.InitializeWithExistingData subscribed to EditorApplication.delayCall results in several seconds of added overhead because it's loading objects.

Editor versions tested: 2020.3.0f1 (first available), 2022.2.0a1, 2023.1.0a1, 2023.1.0a26


Tested using a 2019 MacBook Pro 16" i9/32GB

  1. Resolution Note:

    Duplicate issue. This one was hiding in the backlog so I missed that it was the same thing. Solution in progress.
    Duplicate of

Comments (2)

  1. matiasges

    Dec 19, 2023 13:56

    Same Issue in Unity 2021.3.32
    Since I added cinemachine is super slow to open my project and enter playmode.

  2. ClementSchepens

    Jun 19, 2023 08:30

    It seems linked to the number of timelines in the project. With near 1000 timelines I have a 27 seconds overhead when entering play mode and at every domain reload.
    I’ve created 256 empty timelines and it added 14 seconds of overhead

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