You could flatten the image and it would be far smaller without visual loss. Of course, there would be a lot of data loss and re-editing would be difficult.
Gigapixel could help, but pre or post wouldn't make much difference...
FWIW even the hardest crop shown is less than 100%... it's ~ 4.7 MP from a 46MP sensor downsampled to less than 1MP for posting in the forums. But the compression from 4.7MP to 0.8MP doesn't reduce the visible detail...
LR's dng compression is lossy, but there is potentially a whole lot of information in a raw file that is visually imperceptible. I.e. a human can only detect about 7 different values between each stop of light, while there are more than 8k values in the last stop/bit of a 14 bit raw file...
I think the main concern is where the cache and swap files are located/accessed. A significant speed increase can also be obtained by editing using smart previews instead of the full size original.
I also made two other crops... I originally went with the tightest composition (I normally do).
IMO, this last one doesn't have quite enough resolution remaining... there's very little detail visible.
This is like another "how hard can you crop" scenarios... but it also shows how cropping...
The first two images are just a bunch of bird butts... not generally going to be an interesting image. Maybe if there was one in the flock that was looking back and you focused on it. The third image is just kind of in-between... there's not enough of a flock for it to be the focus of an image...
From what I understand, the primary benefit of the MkIII is that when combined with some of the MKII supertele's it allows certain bodies to retain f/8 and cross type autofocus for all focus points. IMO, this must be due to a higher total/combined IQ for those combinations.
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