If you weren’t talking about a networked server I’d suggest Adobe’s Lightroom. But on a server! If you are accessing the images from another machine on the network could it be a network bottleneck. Any wireless network is going to much slower in the real world than the headline speeds that are mooted, you’d ideally be wanting to access it via a gigabit wired network.

I hope you posted this in the computer group also. They would be more likely to have an answer. As I recall, Oracle allows you to store images, have you tried them?

Sony invented digital photography and their software is very user friendly.