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I'm not sure I understand quite right what you are doing. But, with gimp, saving as jpg, then rescaling the file is not the right thing to do: if the jpg file is not closed, it still has all the layers...
So, with my .xcf open (that's the gimp format, similar to psd), I select "save a copy" (a jpg one, of course), then open the .jpg, with one layer only, and rescale that one.
This requires more mouse-clicks, but is faster, since the computer only needs to rescale one layer...
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