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Why not? Are you trying to make this effect manually?
Make a ModuleScript that has a function which makes the tweens for you, less lines used up
You can also TweenObjects from the server I believe? Correct me if I’m wrong but I could’ve sworn I did it at some point.
I don’t think there’s really another way for you to achieve something like this. Also not sure how it would work out, but what about using beams?
Well if you wanted to make a Sine Wave effect with Transparency without using tweens I’m pretty sure it would take up more memory on the whatever end you’re making the tween on due to more lines. + I don’t really think there’s another way to go about this other than tweening as roblox does not mention a work-around-it without using tweens in the API reference manual