You do not need to narrate every number. Give the interviewer a short orientation, take a brief pause to read, then talk through the few observations that matter.

Start with the title, axes and what the exhibit is measuring. Then identify the overall pattern before jumping into individual data points.

A natural bridge is: "I am going to take a moment to understand the chart. At a high level, I see revenue growing while margin declines, so I want to understand what is driving that divergence."

That keeps you from going silent for too long without turning the analysis into a play-by-play of your eyes moving across the page. You can also signal that you are reading silently by saying you want a few seconds to orient to the exhibit before you begin discussing it. For more detail, see the case interview data-analysis guide.

I use 5-10 seconds of silence, then say what the chart is showing at a high level before touching details.

Would something like "I will take a moment to orient myself to the axes and trends" sound too scripted?