Sparse files are set to false in uTorrent.
I tried also some different things.
I can access a NSS volume on a Netware server via several ways, but the windows internal CIFS and the Netware Client native are the most common.
Here are the results:
1.
ImgBurn detects NSS filesystem as FAT:
CIFS: yes, Netware Client: No
2.
Using ImgBurn "Create image file from disk" command to create an image
CIFS: it takes 1 minute to create file, Netware Client: it takes less then 1 second
3.
Using uTorrent to open a 6GB torrent:
CIFS: it takes 2 minutes to create file, Netware Client: it takes less then 1 second
So there is no problem with the speed, this is how windows (CIFS) handles it, uTorrent is same fast as ImgBurn, sorry for not testing it throughly enough!
The only problem is that the windows api returns FAT for NSS volumes over CIFS, but if it can be overriden with the set file splitting to 'None' option, this problem is finished.
(Now I have to find that option only.)