Opening Create New Shader Graph from the Output context menu causes a long delay before the content appears

Steps to reproduce:

1. Create a new project
2. Create > Visual Effects > Visual Effect Graph
3. Create Simple Loop VFX
4. Open newly created VFX
5. Convert output context to Output Particle ShaderGraph Quad by right-clicking on Output > Convert Output
6. Click button New...

Actual results: Window content loads only when indexing has finished which takes up to several minutes

Expected results: Window content loads immediately or after a short delay

Reproducible with versions: 6000.6.0a4
Not reproducible with versions: 

Can’t test with versions: 6000.6.0a3 (New button in the Output context is not introduced)

Tested on (OS): macOS

Notes:

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