The speed at which the action of a story is narrated is called the pacing. Pacing refers to how quickly or slowly events unfold within the story, affecting the overall rhythm and tension of the narrative. Effective pacing can help build suspense, maintain the reader's interest, and create a sense of momentum.
Adverbs typically modify verbs by providing more information about how, when, where, or to what extent an action is performed. They can describe the manner in which an action is carried out, such as quickly, slowly, or eagerly.
Slowly.
SLOWLY
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The opposite of quickly is... slowly.
Pan is when a video camera is moved in azimuth (horizontally). It can be done slowly or quickly. Done slowly it is called slow pan.
Slowly by cellular respiration, quickly by combustion (burning).