Comment by kristianp

The newish windows photo viewer in Win 10 is painfully slow and it renders a lower res preview first, but then the photo seems to move when the full resolution is shown. The photo viewer in windows 7 would prerender the next photo so the transition to the next one would be instant. The is for 24 megapixel photos, maybe 4mb jpegs.

So the quality has gone backwards in the process of rewriting the app into the touch friendly style. A lot of core windows apps are like that.

Note that the windows file system is much slower than the linux etx4, I don't know about Mac filesystems.