Manage Huge DAM asset folders of size 1.5 GG

I am using AEM 6.1.
Few of the AEM DAM folders on author have images around 1800 count and lead to folders size around 1.5 GB.

Ex:
/Content/DAM/mysite/images/(100 images in below folders)
/Content/DAM/mysite/images/homepage/(1700 number of images in it of 1.5)
/Content/DAM/mysite/images/winners/(20 images in it)

Now problem when click on "homepage" folder it is taking very long time to open and sometimes leading to timeout, or sometimes when clicked on this folder node nothing is displayed.

http://localhost:4502/damadmin#/content/dam/mysite/images/homepage/

What is the best way to orgarnise these huge sized DAM folder.

Another question :
How to archive unused images with the option to restore then when it needed in future and keep in AEM itself.