04-03-2021, 10:38 AM
Not much different from your set up: using Kubuntu 18.04 / Gimp 2.10.22 / 8 GB memory / i5-6200U CPU @ 2.30GHz
7000 x 4860 pix is a large image, for a new image Gimp gives a 317 MB size notification.
However if I auto-generate some layers (15) all different sizes and a bit of editing I can get up 1.9 GB in memory I can recover some of that from the undo dock. https://i.imgur.com/ogGjNHm.jpg
Big image will be slow, the only thing I can suggest is Edit -> Preferences -> Interface and disable Layer Channel Previews and Layer Group Previews That might get a little improvement https://i.imgur.com/8GaylmN.jpg
7000 x 4860 pix is a large image, for a new image Gimp gives a 317 MB size notification.
However if I auto-generate some layers (15) all different sizes and a bit of editing I can get up 1.9 GB in memory I can recover some of that from the undo dock. https://i.imgur.com/ogGjNHm.jpg
Big image will be slow, the only thing I can suggest is Edit -> Preferences -> Interface and disable Layer Channel Previews and Layer Group Previews That might get a little improvement https://i.imgur.com/8GaylmN.jpg