To find out the speed of a network card or port in a FreeBSD system, you can use the ifconfig command with the -m option.
For example, to view the speed of the em0 interface, you can use the following command:
ifconfig em0 -m
This will display information about the em0 interface, including the speed. The speed is typically displayed in megabits per second (Mbps).
You can also use the dmesg command to view the system log, which may include information about the speed of the network interfaces. For example:
dmesg | grep em0
This will display any log entries that include the string "em0", which may include information about the speed of the em0 interface.
For more information on the ifconfig and dmesg commands, you can refer to the documentation or use the man command to view the manual pages.