It means that ThumbsPlus is reading the thumbnail records for that folder from its database, matching it to the image files on disk, and building the list so it can display it.
Things that may slow down the process include:
- When the folders and files are on a slow (network or external) drive
- When you have very large numbers of files or subfolders in a folder (e.g. 10,000)
- When you use Color Management in the thumbnail listing (
Options | Preferences | tab:Thumbnail view | Enable Color Mgt and
Options | Viewing | Color Management | Thumbnail View)
- When you display one or more User Fields in the thumbnail listing (press light bulb button above listing to select fields)
For many more suggestions see the
ThumbsPlus Performance Hints on Cerious' website.
Anyway, rest assured that the program should (be able to) work much faster than you seem to be experiencing today.