I don’t believe that’s true. My argument is that that’s not actually a real difference, at least not hardware-wise.
Use whatever looks best for your scene! If it runs too slow, it’s probably the shaders or the size of your billboards that matter, not the specific blend mode.
Btw, generally “additive” is done as “pre-multiplied,” where you get to add the color channel directly, and the background is subtracted by the alpha, which is a much more flexible blending mode, as it allows you to do pure light, pure smoke, and anything inbetween.
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