XnView Software

This settings is only for RAW not jpeg, but you have always problem in your folder, right?
Actually, not. It works perfectly fluent even in my (problematic) folder, does not matter whether the next image is Jpeg, or NEF, it makes no difference in speed - perfectly OK. However, I now noticed that ...

In the test folder (5 jpg), could you add a NEF file?
I did. Works OK now. To be honest, after changing to "embedded thumbnail" it immediately started to be fluent. Great, thank you.
What about the ICC, is it necessary to change it somehow?

What was the problem, why it worked for D3100, D90 etc ...

So if you have a folder with 5 D7000 files, you can reproduce the problem?
Do you mean to put those 5 D7000 images into new folder? I tried it, works OK - both forward and backward browsing is fluent. However, the same 5 D7000 images in theirs original folder (where is rest of images located ...

However, the same two images (D7000) in their original folder (where all other images are located - there is approx 100 images and several other subfolders with a few images) have a delay more than 6-7 seconds.
Strange, 6/7 seconds to load next image file all the time? Or only the first time?

I ...

sure. d7000 image (largest possible JPEG)is in first post. I could also send a NEF file, but its 15+Mb and its quite difficult to share that size on-line (perhaps if you could advise some server that can accept such size of image)..

D3100 http://img64.imageshack.us/img64/2127/dsc0028rh.jpg
D90 ...

sure. d7000 image (largest possible JPEG)is in first post. I could also send a NEF file, but its 15+Mb and its quite difficult to share that size on-line (perhaps if you could advise some server that can accept such size of image)..

D3100 http://img64.imageshack.us/img64/2127/dsc0028rh.jpg
D90 ...

no, D7000 has largest sensor of those. However, even medium size image from D7000 (that match to the default "large" size category of D90, D3100) makes the problem for viewer.
I'm in view mode

These two images are not resized in PC, they're both directly from camera D7000 (first original is "Large" size, second image original Medium size as in camera setting).
I checked also images from D3100 - no problem to handle them for Xnview. D60 no problem, D90 no problem
Compact camera Canon G7 no ...

here it is:
http://img715.imageshack.us/img715/9608/dsc0618ps.jpg full size image from camera
http://img51.imageshack.us/img51/7448/dsc0917u.jpg this one is a medium size photo from camera

I used xnview for years, excellent viewer. But since I got my Nikon D7000, I found out xnview cannot open fluently images taken with this camera. Any other camera I used (various Nikons, cannons etc.) it was OK, however Nikon D7000 images (not only NEF/raw, but even simple JPG) make a big problem ...