I don't know if its normal but with the default LAN net to anything the comunication between my pcs are slow, if i put a aliases of group of pcs to group of pcs the communicaton goes faster, i think the LAN net aliases is not working fine.
Strange thing is: traffic inside your LAN should never reach the sense... If configured, your clients get an IP via DHCP from your sense and then they start talking to each other without ever involving the sense.
Test: unplug LAN port cable from sense and watch your clients (as long as they don't need to refresh their IPs, as said before').
Ok, then i have bottle problem with internal sql, thanks.