@Grum999 I’ve just tried the appimage and the ‘delay’ that I see is 4px of image size at 2048 x 2048 and 4096 x 4096 predefined templates no matter what the zoom setting. These two templates are 100dpi.
With a 2028 x 2048 image at 600dpi, the delay is 18 px.
With the A4 600dpi, it’s also 18px.
At 1200 dpi, it’s 36px.
At 50 dpi it’s 2px.
At 10dpi it’s 1px.
The dx and dy seem to be physical image distances.