Robert P. Munafo, 1993 Dec 23.
Optimizations are one type of speed improvement (see that article for more).
There are two classes of optimizations, both described more fully under their own headings:
Adjacency Optimizations exploit the occurrance of continuous solid regions in the image (such as the interiors of mu-atoms).
From the Mandelbrot Set Glossary and Encyclopedia, by Robert Munafo, (c) 1987-2017. Mu-ency index
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