Hi chiraag, thanks for an interesting workaroud. I may use this when working on my 15-inch laptop (which isn’t often), but my main desktop display is a 31-inch one, so unfortunately 1920x1080 would be too huge and ugly.
Weird thing though - with resolution set to 1920x1080 lighttable seems a bit snappier than on full 4K with darktable window resized to one quarter of the screen (which should result to about the same number of the redrawn pixels). Maybe something else is in play as well.