Strange artefacts in Cascade editor with Beams

Development Asset Creation FX
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1

I’ve been trying to create some kind of lightning effect around my weapons like the enchantments in Dark Souls, so I created a Particle System consisting of beams going along the axis(the weapon). But suddenly, these strange artefacts appeared:

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I have no idea what they are, where they came from and how to remove them, but I think they already crashed my editor.

2

I just resolved it myself. It seems to have some connection with the speed variable of the beams.
If I set the speed to 0, the artefacts dissappear.

3

Thank you! Believe this seems to have done the job, thanks for sharing! Was thinking about doing my own with a spline but I think you may have saved me the trouble.