Weird artifacts on edges after split command

is this just an optical issue ? or is it something i have to take care of ?

regards

looks like a visual thing to me.

you could duplicate those edges to make curves and double check.

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You should make the mesh finer/smoother:
I use this

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i tried your settings
but everything looks a lot worse now

Hello - yeah, the settings in the image are for a very coarse mesh - but that is where to make the changes.

See
https://wiki.mcneel.com/rhino/meshfaq

Note unjoined edges will generally always show some discrepancy if you zoom in enough.

-Pascal

ok thanks for explaining Pascal

his max angle is set extremely high i think, try 1 or 5