No players - Sudden FPS drop

[indijdev 7]

I've noticed that the FPS drop over time and sudden drops happen, even if noone is logged on to the server. I.e:

Server stabilized at around 6.2k FPS after last player logged out and steadily dropped over the next hour or so. Then came a sudden drop of almost 1000 FPS.

19:08:47 Average server FPS: 5772.77 (measured interval: 30 s)
19:08:47 Players: 0 in total
19:09:17 Average server FPS: 5798.40 (measured interval: 30 s)
19:09:17 Players: 0 in total
19:09:47 Average server FPS: 4940.93 (measured interval: 30 s)
19:09:47 Players: 0 in total
19:09:49 Used memory: 3194744 KB
19:10:17 Average server FPS: 4855.93 (measured interval: 30 s)
19:10:17 Players: 0 in total

It rose back up and stabilized at around 5150 FPS.

 

Does anyone know why this is happening?

When people are logged on, I get the occasional message of *Item [x] is hard to place, performance drops: "<Item>"*, but these messages don't appear when server is empty.

Do the restock still take place, but just isn't logged?

 

- indij