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Fixed in Unity 2018.1



Found in


Issue ID




Editor gets slower when scrolling trough Treeview provided from UnityEditor.IMGUI.Controls




Priority: 2Necessary for shipping a final release


Severity: 2Core functionality majorly impacted

How to reproduce:
1. Open user attached project
2. Go to "BugReport" --> "Open TestCode window" (Custom menu items)
3. Move the "TestCode" window around and notice that it is fast and responsive
4. Scroll to the bottom of the Treeview and then to the top again, do this 10 times.
5. Move the "TestCode" window around again

Expected result: "TestCode" window is still fast and responsive
Actual result: "TestCode" window is laggy and not responsive as it was before

Regression introduced in - 2017.3.0a3
Reproducible with - 2018.1.0a5, 2017.3.0b10, 2017.3.0a3
Not reproducible with - 2017.3.0a2, 2017.2.0p2, 2017.1.2p3

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