BRU struggling with scanning folder with lots of files?

[art2work4]

So I have folders with sometimes thousands of pictures. When I start BRU and select such a folder in the tree on the left, then Scanning those folders takes forever.
When I open such a folder in WIN Explorer the files are shown almost instantly.
What could be the cause for this slow scanning?

thanks

[TheGhost78]

Do you have Renaming Options > ID3 / EXIF Data / File Properties ticked?

[TheGhost78]

Consider adding subfolders for years or subject, for example.

https://serverfault.com/questions/420554/whats-the-best-way-to-store-thousands-of-images-in-a-windows-folder-structure