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Resizing an image in Gimp is very slow.

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Resizing an image in Gimp is very slow. CharlesJ-J 10 Feb 20:56
  Resizing an image in Gimp is very slow. Shlomi Fish 11 Feb 08:29
  Resizing an image in Gimp is very slow. Liam R E Quin 11 Feb 10:22
2020-02-10 20:56:34 UTC (8 months ago)
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Resizing an image in Gimp is very slow.

I often have an image size of up to 5000 x 4000 px and maybe 50 or more undo history. There is often 10 - 15 layers, but I have then flattened the whole lot. When I go to resize it (to 1800 x 1200 px) Gimp is VERY slow. The progress bar will move quickly to ,say, 2/3 of the way, then stop for sometimes up to 3 or 4 minutes. I have 10.4 Gimp. I have tried deleting the undo history, but with no difference. If I have a saved XCF file, I have tried closing my image, then reloading it. When Gimp is stalled, it uses high CPU but not disc. Then the resizing process is fast. Have you any idea why this happens & how to solve it?

CharlesJ-J (via www.gimpusers.com/forums)
Shlomi Fish
2020-02-11 08:29:41 UTC (8 months ago)

Resizing an image in Gimp is very slow.

Hi CharlesJ-J,

On Mon, 10 Feb 2020 21:56:34 +0100 CharlesJ-J wrote:

I often have an image size of up to 5000 x 4000 px and maybe 50 or more undo history. There is often 10 - 15 layers, but I have then flattened the whole lot. When I go to resize it (to 1800 x 1200 px) Gimp is VERY slow. The progress bar will move quickly to ,say, 2/3 of the way, then stop for sometimes up to 3 or 4 minutes. I have 10.4 Gimp. I have tried deleting the undo history, but with no difference. If I have a saved XCF file, I have tried closing my image, then reloading it. When Gimp is stalled, it uses high CPU but not disc. Then the resizing process is fast. Have you any idea why this happens & how to solve it?

This works fine for me with gimp-2.10.14 on mageia linux v8 on a sandy bridge core i3 box. What are your system specs? And can you share a problematic sample image? See https://github.com/shlomif/writing-the-perfect-question .

Shlomi Fish       https://www.shlomifish.org/
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Liam R E Quin
2020-02-11 10:22:59 UTC (8 months ago)

Resizing an image in Gimp is very slow.

On Mon, 2020-02-10 at 21:56 +0100, CharlesJ-J wrote:

I often have an image size of up to 5000 x 4000 px and maybe 50 or more undo
history.

Notice the memory usage in the title bar and/or status bar. When GIMP is using all of your memory, everything will be very very slow.

(1) Make sure the "tile cache size" is set to at least half of your physical RAM in Edit->Preferences. You may need to experiment as you didn't mention operating system or how much memry you have or whether 32 or 64 bit.

(2) there were some speedups - get 2.10.14, not 10.4, and see if that helps?

i routinely work with large images but not with 35 layers. Sometimes 40,000 pixels on a side.

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