Executing the command "show arp" takes a long time to load and show results.

Executing the command "show arp" takes around 2-3 minutes to show any output.

By default, when the command "show arp" is executed, it tries to determine the hostname of the IP address.

This will take a long time, depending on the environment.

Use the command "show arp no-resolve," which skips this hostname check and displays the output instantly.

Please check - https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/command/show-arp.html