My suggestion is whether it would be possible to index the amount of subfolders and -files, ideally separately.
Perhaps crawling(I don't know the proper terminology here) through thousands of diverging paths could pose some problems
regarding the speed of the initial indexing, but I wouldn't know...
In any case, I'm extremely glad to have found this truly wonderful application, it makes searching and organising files so much easier,
thanks so much for you for your continued effort!