The "Ethernet Devices" driver tries Port 2222 first, and Port 44818 second if Port 2222 is reported as closed (it will be for ControlLogix hardware). You can skip the initial Port 2222 query in RSLinx 2.52 or higher (I think) by appending ":EIP" to the IP address in the driver configuration.
So if I interpret that correctly I can improve the time it takes RSLinx to browse a driver tree by adding :EIP to the ControlLogix and CompactLogix IP addresses and it will skip the 2222 queries.
