I have been stuck with acdsee 3.1 for many years, just waiting for a fast viewer and also with support for Maya IFF.......
And today is the day.....bye bye others...welcome xnview....
I also would like to say thanks to the developers for this excellent software.
Now, after a very intensive test, there are some things that will be very interesting to check/fix/implement.....
xnview does not display an image until it is fully loaded in memory.

If you switch from viewer to browser from a small image, the browser its compressed.



If you use toolbar buttons to go to next/previous image (or rotate), if the images are different size, the mouse still in place while window moves, so you have to move the mouse again to the button.

When you drop an image to xnview or double click on an image associated with xnview. An empty browser windows opens first and after (when the image is fully loaded....that´s why i like single buffer


And as in the post suggestions from a 3D animator(just like me)
You have an option to "Zoom Lock", if you see sequences then


and also

so you can see Red channel pressing "R" o Alpha pressing "A" (instead of "M")
Well, just some thoughts........
Thanx again.