Interpolation Algorithm

Hello! I am using Cesium to produce a visualization of transportation networks in New Jersey. I have found myself using the interpolation algorithm built in the CZML language and was wondering if someone could tell me exactly what is going on when I call the interpolation algorithm for numerous paths taking place during the day.

Are the interpolation calculations completed for each of the 200 paths and then the paths appear on the screen or does the interpolation occur at each second. Insight into how the interpolation works will help me understand how to best keep the visualization from taking too long to load and/or becoming distorted.