ARP slow to load
I've always noticed this with pfSense. Every router we have (hundreds) the Diagnostics -> ARP page is incredibly slow to load. If i run arp -na from the command line, it comes back almost instantly. Running arp -a takes a bit of time too, but maybe half the time the gui does. The gui page takes a minute or more to load, however.
jimp Rebel Alliance Developer Netgate
The ARP table page attempts to correlate entries with DHCP leases and reverse DNS resolution for hostnames. Either one of those could account for a delay.