Consider implementing better RAW processing method #7
Description
As of now, processing RAW files literally deletes my system's RAM and will crash computers it's so slow, this is due to the insanely out of control multiprocessing threads implementation.
I think it's due time for a better implementation. One optimization would be thumbnails: extracting a full size JPEG from the RAW file, and then extracting a tiny thumbnail from that yields a large IO processing time that NEEDS to be cut down if full library processing is going to be anywhere near feasible.
preview-generator may yield a good results, but due to it being a rather new module, we should leave open options for multiple possible processing methods in the commandline options.
Perhaps looking into external image processing programs would be a good idea, including them as different 'thumbnail methods'.