So, what happens is, when you select a library location, MT scans that file location for a list of files (eg images). It then searches the thumbnail cache (under .maptool), if a cached thumbnail exists, it uses this, if not it creates a new one on the fly. If the thumbnail is smaller in size than the original, it caches the thumbnail. (so if you have a bunch of 25x25 images, it's not going cache those).
I'm seeing that if the "cache" gets very large, it takes longer and longer to search that cache for images. If you clear this cache it restores the speed. I may need to look into if cache is even worth it, or add an option to only cache files > x mb, or auto clear cache images older than 1-2 days...
You can do it manually by double clicking the thumbtack area.
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