Pacing
Pacing is the overall pace of the film, whether it's generally slow or generally quick; it reflects the overall feeling of the film. An Action film, for example, should have a fast pace in order to correlate to the expected onscreen action. Conversely, a Rom-Com should be more slower paced to fit in with the more intimate feeling of the film. Pace is dictated by how long shots last for on average and also how much action is shown within the cuts.
Breaking Bad is known for its slow pace; the first shot
of this clip lasts an entire 35 seconds.
Timing refers to how often the clips in a film are cut up. A conversational scene will naturally have less cuts to accommodate for its naturally slow paced feeling. A fast paced action scene, however, will include more cuts than your average scene in order to fit the pace of the action onscreen. More cuts means the audience is kept on their toes when watching something.
The rather erratic timing of the multitude of cuts within
this music video means the video isn't as dull as
it would be with longer shots.
Rhythm
The general rhythm is dictated by both of the above factors when editing a scene. Rhythm is where the cuts and pace are timed in a way that the audience can get a good feel for when the editor cuts during a scene. This allows the audience to get a grounded sense of both pacing and timing during a film; a good example of rhythmic editing is editing to the beat in a music video.
The cuts to the beat in this music video give the video
a sense of drive and rhythm throughout.











