Pacing controls the speed and rhythm in your narrative. It's a literary technique that determines the story's appeal. In a novel, you're going to have to convince your reader to keep going for longer. Pacing is affected by the number of plot events in your story (quickening the pace), as well as the level of detail (slowing the pace). Variation and balance is the key
How well you handle the pacing is determined by the complexity and sustainability of your main idea. You can control the pace through mix up, which means using short sentences and active verbs in intense action scenes, and details for slower-paced scenes. Writers use pace by choosing the exact words. In short, pacing is moving a story forward with a certain speed.