If you don’t use the embedded presets then each image has to be processed with 
the default workflow. Once processed, they’re cached. 
So it’s worth to tweak your OpenCL settings 
https://www.darktable.org/usermanual/en/special-topics/opencl/


> Am 03.01.2021 um 02:32 schrieb Germano Massullo <[email protected]>:
> 
> After I import some images in darktable 3.4.0, I wait to let all
> previews appear, then I zoom to maximum size in order to just see one
> image per time. The first time I scroll to move among images, I can
> observe darktable being in "working" status because it still needs to
> work on the preview. If I scroll back to the just scrolled images, they
> immediately appear. Can I force some special tweak in order to just tell
> darktable to take all the time it needs to elaborate all previews
> without having to require further work? I already increased 4x the
> minimum memory options in darktable, and I can increase these specs even
> further.
> darktable lighttable thumbnails options are:
> - color manage cached thumbnails: true
> - don't use embedded preview jpeg but half-size-raw: false
> - high quality thumb processing from size: 720p
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