Performance issue. 100% chance that server has problems if there is lots of images.
Be aware that each images data is extracted from the file directly when the page is loaded (category, thumbnails, picture page). If you have albums with tens of thousands of images in one single album, this could cause your server to crash, burn your house, kill your cat, etc. You have been warned.
Performance issue. 100% chance that server has problems if there is lots of images.