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I'm not a programmer, so I make the following observations based on previous rendering methods, used by other rendering programs.

The line by line rendering method is very very time consuming, since it reevaluates each line individually, without any consideration as to similar pixel color combination's that the scene may contain. Some programs use a smaller window, or windows (some dedicate one window for each CPU) to help evaluate similar pixel colors. Having arrived at the final color they then concentrate only on other pixel colors in that scene that have not been determined yet, to produce the final image.

I'm making these observations based on a question posed on the subject of pixel output.
http://www.fractalforums.com/fractal-related-links/how-to-render-large-images/msg30066/#new
the final 5000 x 4000 pixel image took 1HR 20min to produce on a Quad core 2.4 CPU machine, with 4 GB Ram, running Win 7

Is there a possibliity to engage an alternative rendering method, of the type I described, in the future?

curious!