I doubt you've ever tried doing a selection rectangle to that size and getting
it exactly the right size and boundaries. It is a very slow and fiddly
operation.

>Layer groups internally create a virtual layer representing their
>entire composited contents to speed up overall rendering of the image
>(at the topmost levels); a similar thing already occurs when you have
>a project containing text layers.
>
>
>Alternatively, you mentioned your process involves resizing the image
>canvas as a means to 'crop' a given portion of the image out to a JPG?
>If this is your only performance bottleneck then finding a way to
>avoid that step should work around the issue entirely.  How about
>trying these steps instead?
>
>1- Create a rectangle selection of the desired export size (e.g.
>4800x7200) at the desired location in the image
>
>2- Edit > "Copy Visible" (copies from all rendered layers)
>
>3- Paste as New Image
>
>4- Export
>
>
>
>-- Stratadrake
>strata_ran...@hotmail.com
>--------------------
>Numbers may not lie, but neither do they tell the whole truth.

-- 
BWK (via www.gimpusers.com/forums)
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