Import and export

DevTools supports importing and exporting performance snapshots.
Clicking the export button (upper-right corner above the
frame rendering chart) downloads a snapshot of the current data on the
performance page. To import a performance snapshot, you can drag and drop the
snapshot into DevTools from any page. Note that DevTools only
supports importing files that were originally exported from DevTools.

Other resources

To learn how to monitor an app’s performance and
detect jank using DevTools, check out a guided
Performance View tutorial.