Hi,
I myself am using Kubuntu 20.04 with Gimp 2.10.x. I have a Tuxedo Notebook with 16GB RAM an an Nvidia GPU with 6GB of RAM.
When I open two TIFs with 230MB filesize and use them as two layers, Gimp works totally fine.
My wife has a Tuxedo Desktop PC, but works with Windows 10, and also Gimp 2.10.x. She has an Nvidia Card with 4GB RAM, and 32GB of system RAM.
Whenever she opens a big TIF-File (by big i mean 250MB) in Gimp, Gimp is painfully slow, brushing is hardly possible. Even just opening the TIF (showing the picture), Gimp needs a long time, as if it would need to paint line-by-line…
So… with nearly similar conditions (apart from the operating system):
Is Gimp on Windows perhaps very very bad with dealing with TIF-Files?
Thanks for your help
Kind regards
That is my experience with it as well. I would use Krita, and utilize gmic. It has non-destructive features including mesh-warping, but a lot of NDE is costly.
Here with W10 , 16GB memory, opening two 512MB 32bits float uncompressed tif files in two layers takes about 3 seconds each with GIMP2.10.18. the same tiff compressed to 372MB takes about 1s more.
No issue with brushes.
Hello @pragomer
From what I have read all Gimp developers work exclusively on Linux
The “GIMP team” is painfully understaffed right now and, IMHO, it is a BIG achievement that they even are able to release a Windows version 
Back to topic, I have just tried to load and paint some very big tiff from here:
https://www.naturalearthdata.com/downloads/10m-raster-data/10m-cross-blend-hypso/
In particular, I have chosen the TIFF: " Cross Blended Hypso with Shaded Relief and Water", which is around 378.42 Mb as compressed ZIP file to downlaod.
I have tested this TIFF on my 5 years old ASUS notebook with:
- Windows 10 - GIMP 2.10.22
- Cpu Intel I7 6500U
- 8 gb RAM
This Tiff (683 mb, once unzipped) loads in around 10-15 seconds.
It is pretty fast to zoom in-out and to pan around this huge TIFF image
I have also tried to paint on this tiff image, with 2 layers of the same Tiff on the GUI, and it is pretty fast.
Here is the mandatory screenshot:
Hello @pragomer
Just tried to apply a Blur filter on this huge TIFF of mine (nearly 700 mb).
As soon as I have moved the sliders in the filter my whole Windows 10 system freezed to death. Not even the Task manager (ctr+alt+delete) worked and, in the very end, I was forced to shut down the entire system.
To recap, GIMP 2.10.22 is indeed prone to problems with huge TIFF images on Windows
with your image, W10, GIMP2.10.22
- 5 s to load
- no problem with different sort of brushes
- trying to apply focus blur : memory use increases until 13GB! then after there is an intense disk access . I didn’t waited until end.
It’s surely due to memory management on windows, but it is not surprising with the lack of windows dev.
Hello @gaaned92
Thanks for testing 
It’s surely due to memory management on windows, but it is not surprising with the lack of windows dev.
I am not 100% sure it is only a Windows problem.
I have often read that the blur filter, in particular, in GIMP is poorly optimized.
See this “similar” bug, for instance:
If you take a look at the GIMP Issue tracker there are around 2576 open tickets:
What it is a bit depressing, even though it is nobody’s fault, is that these past months there has been only a single steady developer (Jehan):
On the GEGL side it is even worse…
Looking on the bright side, there are plenty of different developers on Darktable, right now, making daily commits on github
Hi…
the issue is compeletly solved. I downgraded from 2.10.22/20, thank to your posts my friends, to 2.10.18 and now Gimp runs fast as hell also on Windows.
So, it was a versioning thing.
Thank you all so much !
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