Looks sweet, how is it lit?

> For each blob all other points are tested

if you really mean "all other points", you could probably
optimize this for a large number of bubbles by sorting vertically
in n log(n) time ... so unfortunately no bubble sort :D (*groan*).

Then you only need to test points up to a maximum y distance. Of
course such information might already be available depending how
you generate your points in the first place.

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