Steps to reproduce:

1. Create a new project using the High Definition 3D template
2. Create a new blank Shader Graph (Assets > Create > Shader Graph > Blank Shader Graph)
3. Make sure Scene View is visible
4. Select the newly created blank Shader Graph in the Project window
5. Enable "Use As Template" in the Inspector window
6. Click on the Icon selection field 
7. Click on any of the textures
8. Observe the Scene View and the Select Texture 2D window

Actual results: The Scene View is flashing and the Select Texture 2D window is extremely slow

Expected results: The Scene View is not flashing and the Select Texture 2D window is responsive

Reproducible with versions: 6000.5.0a8, 6000.5.0b1, 6000.6.0a1

Not reproducible with versions: 6000.3.11f1, 6000.4.1f1, 6000.5.0a7

Can’t test with versions: 6000.0.71f1 (due to no Use As Template functionality)

Tested on (OS): MacOS SIlicon Tahoe 26.3

Notes:

• Scene View only flashes once on URP, but the Select Texture 2D window is slow