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@bnewbold It's a bit like... when I wrote my first platformer video game I was like "why is it getting so slow when I am adding so many enemies?" And that's because I knew very little about algorithms and had every enemy do a collision check against every other enemy. O(n^2), of course. As I learned more I l learned how to filter down the information of what's relevant to that enemy.

Directed delivery is one way to do that.