Opening an outline a level at a time

Math's sample outline is small. A real curriculum can have hundreds of rows: every level, module, topic, and lesson, and every lesson's resources. Your tools don't read all of that to show you the part you're working on.

Instead, they open it a level at a time. The first read brings the top two levels: Level 2 and its modules. Opening a unit reads the rows directly inside it, and nothing deeper. A closed unit already knows how many rows it holds, so the outline can show that count before anything inside is read.

Try it: open Module 1, then Topic A, and open the timing line to see one more read each time.

Outline of Math, opened a level at a time

Select a row to see which read brought it, and how many rows it holds.

3 rows shown, from 1 read. 2 units are closed, and each one's count says how many rows are inside before they're read.

From the sample curriculum

content-sdk took 42 ms

Find the curriculum15 ms
Read the top two levels of Math's outline26 ms

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Loading the outline of Math

Each unit you opened was one small read of just its own rows, so opening part of a large outline takes about as long as opening part of a small one. The count under a closed unit comes with the unit, which is why it's there before the rows are. In your tools, a large outline may open in pieces, and the count tells you what's inside before you look.