As a long time GIMP user, coming to Darktable has been a revelation. I'm super impressed with how powerful and polished Darktable is, and overall I really love it.<p>On the other hand, Darktable has some serious issues that make it less than ideal for me.<p>First, on my old laptop Darktable is super, super slow... especially when the image I'm editing has lots of operations performed on it. In that case, performing a simple operation on top of the existing ones or just zooming in or out could take a full minute, and exporting a single image could take 30 minutes or more (compared to GIMP, which takes less than a minute). Just going from lighttable to darkroom or back could take multiple minutes.<p>Second, some operations are just much easier and more intuitive to do in GIMP. For example, making perspective changes in GIMP using the perspective tool -- you just drag the corners of the image where you want them. In Darktable you're limited to moving sliders around, which is far more annoying.<p>Finally, Darktable is mostly geared towards improving photograph quality, while GIMP is more of an all-around image editor and drawing/painting program which can improve the quality of photographs but is not limited to that but can do much more.