So they load an entirely different image first? Why not just (re-)encode the image with interlacing[1] turned on?<p>[1]: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Interlacing_(bitmaps)" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Interlacing_(bitmaps)</a>