high latency means you have a good connection, low latency means
you have a baad connection
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A transcontinental fiber link might have many gigabits/sec of bandwidth , but the latency will also be high due to the speed of light propagation over thousands of KM.
In constract a 56 kbps modem calling a computer in the same building has low bandwidth and low latency
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Latency is defined as the network speed in which the information
being broadcast from the original server reaches the individual's
device by measurement of milliseconds. This means that a lower
latency will allow more information to be sent or received and
thus, creating a better experience. Improving low network latency
can be accomplished by establishing more latency-sensitive software
so that multiple tasks and improved performance can occur.
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For best performance, bandwidth should be high and latency low.
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Improved security makes sense, but actually Cisco says " Keeping
the network diameter low ensures low and predictable latency
between devices."