Dragon (Deep version)

[hapf]

This render at a resolution of 26752 × 20064 took more than a week but I was also running several instances of kalles fraktaler that were doing Newton-Raphson zooming so it's hard to say how much CPU time the render really took. (I could have known if I didn't close the program to free the RAM.)
27204880 iterations are skipped by series approximation with 65 terms but I'm not sure that's how many terms I really used for the render. It could be 33 or 17. Is this what you mean? (I already mentioned how big the iteration count skip is that caused a visible problem.)

A week? Sounds reasonable for an image this big with the ultra fast mandel machine when doing corruption processing as well. The references take a long time. I could skip 27321100 for a 3K version but my region is a bit more zoomed in. And some centers are clipped and would need corruption processing which I won't do since my method is not optimised for references with that many iterations. But I think I can make a little change here to adapt it to such cases.