Are there anyone able to solve this

[dire schooner]

Just downloaded your VFX and I'm also having weird issue with it. First could you give me more context in what you're trying to achieve?
I'm going to slowly unplug/simplify to find the culprit but I need to know what you are aiming for

I can see that the Strip Capacity and Particle per strip count is pretty high while your Strip Index is set to an external property.

Are you planning on Setting the StripIndex with C# ?
Do you want several "Strip/ribbon" per VFX ?

[dire schooner]

After some digging the issue is coming from your setup. As stated earlier you should choose between Velocity based behavior or directly setting the Position. In your case you're doing both and they are in conflict.The "Skip Zero Delta Time" is helping. But When dragging the window the performance is changing and create flickering. If you select your VFX in your project you can also check the "Exact Fixed Time" and that should in conjunction with "Skip zero delta Time" prevent your issue. But, I would advise to take a step back and to try to either use velocity or add some Noise to your position wihtout using the Turbulence Block.

[tacit stirrup]

I see, makes sense - thank you for the great explanation! I will take a step back. I want to create the visuals/wisps that several piano visualizers have, e.g. https://www.youtube.com/watch?v=2n0IkRRX52w. So I started with something simple like a wispy strip (with turbulence).

I will consider using velocity. Do you think my approach of generating big graph-based structures is preferred or is it possible to manage it via code?

[dire schooner]

I do think that it can be done all in VFXGraph for all the visual. Now the question will be more about the sync between sound and visual.