This is the 429th most frequent Spanish word.
velocidad
"Velocidad" means "speed" or "velocity."
In this sentence, 'velocidad' refers to the measure of speed at which the car is traveling, a quantitative term in a physical sense.
El automóvil alcanzó una velocidad de 120 km/h en la carretera.
The car reached a speed of 120 km/h on the highway.
Here, 'velocidad' is used to describe the promptness or quickness of an action or process, in this case the speed of writing.
Durante el examen, los estudiantes escribían con velocidad para terminar a tiempo.
During the exam, the students wrote with speed to finish on time.
In this context, 'velocidad' is applied metaphorically to discuss the pace or rhythm of the unfolding events in the movie.