I, too, have been pondering export times in darktable. Getting opencl working on my hardware made a significant difference, as did selecting “multiple GPUs” in the CL options.
I, too, have recently started using Equalizer, after this discussion on goto modules.
What has puzzled me the most is watching a file manager window of the folder into which I am exporting, and seeing the same jpeg produced multiple times: a slow crawl up to 30MB or so, then starting again. I’m not sure whether this is due to:
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Using the equalizer module
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Setting “multiple GPUs” in my opencl options
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Or some other reason, like the jpeg export quality setting (which I have at 96%)
Is any darktable expert able to shed some light on multiple exports of the same jpeg?