“Speed” is ambiguous:
One does not imply the other:
I can sign Morse code with a laser pointer to a few buildings further, which would be very low latency (speed of light), but extremely low bandwidth too (a dozen bits per minute).
I can load a truck with 4 TB hard drives and drive it across the country, which would be very high bandwidth (a dozen petabytes per hour), but atrocious latency (hours).