What is Vector VM_Experimental? (Niagara -> Unreal Insights)

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I have horrible performance on one of my niagara systems.
One of the causes is something called " Vector VM_Experimental"

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My system only has one emitter (It’s basically a sphere with a material).

I have other similar systems (sphere + material) but only this one has poor performance.

Some component or option must be using “Vector VM_ExperimentaL”
Does anyone know what it is?
Maybe it can be disabled if I know what it is…

Thank you so much

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Ok… i fixed it…

The difference is abysmal now

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i’m not sure how… But i think, that the warmup time was to blame.
I disabled it in the second video and since then all the tests have a very good performance.

NOTE:
We need performance options back for Niagara Blueprints
Now it’s harder to know if something is wrong.