How to reproduce:
1. Open the attached "PreviewSpeed" project
2. Open the "ProjectileTrail" ShaderGraph Asset 
3. Focus on the Shader Graph window and observe the speed of nodes

Expected results: The nodes speed is consistent
Actual results: The speed jumps from the normal to really high

Reproducible with: 6000.2.0a5, 6000.2.0a6
Not reproducible with: 6000.0.41f1, 6000.1.0b10, 6000.2.0a4

Reproducible on: macOS Sequoia 15.3 (M1)
Not reproducible on: No other environment tested

Note: Speed may change every second, sometimes it goes really fast for a couple of seconds and sometimes it stays in normal position, moving mouse inside the Editor and clicking nodes may produce better reproduction results