Not Another Photo Organisation Question

'Ello fine folks.

I had a plan, a fabulous plan, to move my Apple Photos library to my new Synology DS223j, so that we can get to it on multiple Macs in the house, and then have an online backup of some sort from the NAS.

HOWEVER

Apple photos runs slow as all heck. It does work, I can get to it on the NAS (contrary to some posts I've found on here saying it's impossible?!) and it loads, and I can import, but it's unbearably clunky to use.

So I guess the first question is: Is that unexpected? Should it be less slow or have I maybe got something set up wrong? I am using it over WiFi but... even so...

Second one is, is there a better option out there? Should I give up and pay another £100 and something a year to give my pics to Apple instead?

Thanks all.