When working with the files zoomed in to 1:1, everytime you move the displayed image section, the HQ preview seems to be recalculated again for the newly displayd “tiles”.
When you move back again the “tiles” that have already been calculated before also get recalculated again.
I think for the perceived responsiveness of the workflow, it would be very helpful that, at least on very fast machines with lots of memory, you have an option to generate fullsized 1:1 previews in the background that will be temporarily cached for a set amount of images. (active image, working folder or current filter selection e.g.)