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Fixed in 2020.2.X



Found in



Issue ID




Editor hitches on Application.Message.MouseMove when using Mouse3 to move view in the window



How to reproduce:
1. Open attached project ("")
2. Open the scene - SampleScene
3. Open the Profiler, enable Deep Profiling, set profiler to Editor
4. Using the Mouse3 button, drag around the Scene View

Expected result: Scene View does not lag, frame time under 30 ms
Actual result: Scene View starts lagging extremely, frame time goes up to 180 ms

Reproducible with - 2020.1.0b13, 2020.1.12f1
Not reproducible with - 2018.4.28f1, 2019.4.13f1, 2020.1.0b12, 2020.2.0a1, 2020.2.0b10, 2021.1.0a3

Note: Also tested Animator Window. It reveals the same story.

Comments (2)

  1. DaveA_VR

    Oct 24, 2022 23:18

    Happens in 2021.3.2 when I drag a prefab into Hierarchy (of a different open prefab)

  2. Yiming075

    Oct 14, 2022 17:49

    Still happen in Unity 2021.3.11f1 when clicking on "Attach to Unity" in Visual Studio 2022

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