OPC Server for AC800M and Compact HMI

Hello,

I have a couple questions regarding OPC Server for AC 800M and Compact HMI.

1) Having uploaded tags from the PLC to compact HMI, I see there are over 11500 objects that show up as having a 1000ms update rate in OPC Server Statistics, even though I've only connected something like around 100 of them to variables for my small project in the HMI. Is it normal practice to delete all of these unused uploaded objects? It seems they are always being polled, despite not being used, correct?

2) With compact HMI connected, I currently have 2 groups under OPC statistics, a small group of 8 objects updating at 100ms, and the above group of objects updating at 1000ms. I have configured rates of 50, 100, 250, 500, and 1000ms OPC update rates. The actual updates show items being read at 50ms, 250ms and 500ms. I assume the 50 and 500 are for the 100 and 1000ms groups respectively, but where are the 250ms reads coming from?

Thanks!