What does the Instagram Performance Summary in Dashboard refer to?

If you're wondering what do the insights refer to for Instagram Performance Summary in Dashboard since there aren't any insights in the precedent, here's what you should know.

We gather all posts in the selected time period, for example, the last 6 months (16 July 2020 to 12 Jan 2021), add their engagement.

We gather all posts in the previous period for example (18th Jan 2020 to 16 July 2020), add their engagement.

We find the change rate in both periods.

Let's look at an example.

These statistics show that:

your impressions in the current 6 month period were 31.47% less than the previous period.
and your engagement in the current 6 month period were 23.53% greater than the previous period.