[ineiti]

Did you consider something like the following to speed up the calculation? This method can go forward _really_ fast. Not sur e if it can also go backward...

https://pzemtsov.github.io/2015/04/24/game-of-life-hash-tabl...

[ineiti]

In fact I wanted to point to the following... Googling 'hash' put me to the wrong page.

https://en.wikipedia.org/wiki/Hashlife