Capturing a Timeline Trace

Prereqs if recording from Android:

Steps:

  1. Inspect the tab w/ devtools, open Timeline panel.
  2. The only checkbox checked should be JS Profile.
  3. Hit record. 
  4. Do whatever action is slow. (reload, tapping an icon, scrolling).
  5. End the recording
  6. If that looks like it captured the right stuff, right-click and save it.
  7. Zip the file if you can. It'll compress a 40MB file to about 4MB.
  8. Now you can share it: attaching it to a bug, emailing it, or sharing via dropbox/etc.
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