This little migration guide shows you how to record a JS profile in the Performance panel, and how the Performance panel's UI maps to the old workflow that you're used to.
- Open the DevTools main menu.
Warning: The long-term goal is to migrate everyone to the new workflow. This workflow may be removed in future DevTools versions.
How to record a JS profile
Click the Performance tab.
Figure 1. The Performance panel.
Record in one of the following ways:
- To profile a page load, click Record Page Load. DevTools automatically starts the recording and then automatically stops when it detects that the page has finished loading.
- To profile a running page, click Record, perform the actions that you want to profile, and then click Stop when you're finished.
How the old workflow maps to the new
From the Chart view of the old workflow, the screenshot below shows you the position of the CPU usage overview chart (top arrow) and the flame chart (bottom arrow) in the new workflow.
Figure 2. Mapping between flame chart in old workflow (left) and new workflow (right).
The Heavy (Bottom Up) view is available in the Bottom-Up tab:
Figure 3. Mapping between Bottom-Up view in old workflow (left) and new workflow (right).
And the Tree (Top Down) view is available in the Call Tree tab:
Figure 4. Mapping between Tree view in old workflow (left) and new workflow (right).