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Fastness (Noun)

A rate (usually rapid) at which something happens; "the project advanced with gratifying speed".

Nouns denoting attributes of people and objects.

The fastness of the new computer allowed it to process large amounts of data in a matter of seconds.
The fastness of the internet connection was impressive, allowing for seamless video streaming.
The fastness of the train was a major factor in its popularity among commuters.
The fastness of the chemical reaction was a concern for the scientists, who had to take precautions to prevent accidents.
The fastness of the algorithm was crucial in detecting and preventing cyber attacks in real-time.