I have a DayZ server running via Windows for some time now (yes, unfortunately Windows. I would much rather like linux)
Unfortunately I now have some problems / phenomena I can't explain and need help:

In the DayZ Server Console something of 1.5gb ram is constantly displayed. But according to Taskmanager this is nonsense.
I have created an automatic restart via Windows services, where a serverstart.bat is executed.
For example, if it restarts automatically, according to Task Manager, it will only run 500mb ram. However, if I manually restarted the serverstart.bat
the DayZ server uses about 3.6gb Ram according to the task manager.
In the DayZ Server Console there is always about 1.5gb ram usage displayed... Anyone have any idea what the hell is going on? (all data during the server IDLE)

I had some time ago significantly more server FPS (February,March,April,May).
The server had in IDLE always about 3500 - 4000 server FPS and with 1-4 active players about 2500.
Currently the server (I have the problem since June) has about 2200 server FPS in IDLE and about 1300 server FPS for 1-4 players.
But now to the phenomenon that I cannot explain to myself... For example, if there are currently 8 people on the server, the servers remain constant around the 1300 server FPS.
It comes only rarely to drops on 1200 - 1100 server FPS. Also the number of AI's is completely normal between 50 ~ 250, depending on where / how much the players are at the moment.
Also with the increase of the AI number the server FPS remain quite constant on 1300 server FPS. To me it seems as if the server FPS is limited to 1300 as soon as there are players on it, no matter what number.
The DayZ server has mods but I can exclude them because I already tested a DayZ Vanilla server, also via Vanilla the phenomenon is present.
Server Hardware / Software Config:

• Windows Server 2016 standard via KVM <-- I've already read that DayZ servers have problems with VMs. Since the DayZ server has already delivered more server FPS via VM, I can't explain this (nothing has been changed on the VM Config for months).
• 8x 3.07ghz (Host setting not KVM64)
• 10gb RAM
• 1gbits bandwidth
• The DayZ server is automatically set to high priority via start script because nothing else is running on the vServer, Windows processes should queue up :D