Performance: Should I use additive over translucent blend mode?

That’s quite an in-depth amount of information involved there, @jwatte. I think OP wasn’t directing efforts at comprehending the nuances and intricacies of hardware-specific capabilities, but simply trying to see what works in the engine for the situation. How I see it is, if additive simply adds to the current scene color, then it’s limited more in context than translucent blend mode, which is also subtractive and requires more memory or processing probably because it takes other graphics settings into account more. Like shadowing and sort priority, depending on where the translucent mode object(s) are in the scene, as well as the other material settings for those.