High CPU & GPU utilization in inspector tab

When I click on any non-gameobject item in the project view (e.g. script file, asmdef, ...) to see it inside the Inspector tab, CPU & GPU utilization is very high. On my machine (Laptop with i7-4710HQ, NVidia GTX 860M), load is at 30% (CPU) and 50% (GPU) from basically idle. It returns to idle when I deselect the item (empty Inspector view).
[2020.2.0b11]

 

I also got the same error in 2020.2.0b11 and 2020.2.0b12

 

I submitted a bug report on 11/16 Case 1292911
Content:
Unity 2020.2.0.b11 Editor high CPU when select Project tab

1- Create new project in Unity 2020.2.0.b11
2- if select object in Hierarchy:Main Camera,Directional Light.
-Check CPU performance 1-10%
-Check Profiler Editor: Hight: GUIView.RepaintAll.RepaintScene:0%
3- if select object in Project tab:Scenes folder,
-Check CPU performance 100%
-Check Profiler Editor: Hight: GUIView.RepaintAll.RepaintScene:80%

 

Steps to reproduce:
- Create new project
- Select "Scenes" Folder in the Project Tab (not in the Directory tree view, but the Scenes icon in the Assets directory)

Initially GPU jumps to around 50%, then goes down to 25-30%, CPU goes up to 25%+ within 1-2s and stays there.

Seems like the commenter above has already submitted the same bug, so I don't add a duplicate.

 

Screenshots

 

I saw noticeably lower framerates when an asset is selected.
It also affects the Properties window.
I assume this is the cause of the performance issue -- good find.