m_ng78 wrote:
It's not my PC since thumbnails load quickly using Nikon's ViewNX 2 app.
Thanks,
Michael
The Nikon software uses the embedded jpeg thumbnail in the raw NEF file. The organizer creates the thumbnail from a converted version of your raw file; that way the thumbnail reflects the ACR default edits instead of that of your camera setting. The thumbnails in the organizer are updated if you do any edit to the raw files.
You can select a few images and run the 'update thumbnail' option to have their thumbnails created in priority.