apple tv takes too long to load photos

I am running iTunes (11.1.5.5) on Windows 7 and have setup home sharing and accessing the Photo Library from Apple TV 3rd Generation.

We have a lots of photos (approx 21000) organizaed in folders, eg:

Main Photo Folder

Folder 1 (5500 photos)

F1-Sub 1

F1-Sub 2

F1-Sub 3

.

.

Folder 2 (3500 photos)

F1-Sub 1

F1-Sub 2

F1-Sub 3

.

.

Folder 3 (12000 photos)

F1-Sub 1

F1-Sub 2

F1-Sub 3

.

.

Apple TV doesn't show the sub-folders beyond the first set of folders and as a result it takes too long to load our list of photos, is there anything that can be done to fix this?

Thanks!