/chrome-user-timings-bug

Primary LanguageHTML

User Timings Bug Repro for Chrome Version 91.0.4472.77 (Official Build) (x86_64)

Steps to Reproduce

  1. Clone this repo
  2. yarn
  3. yarn start
  4. open localhost:3000
  5. open Chrome DevTools and start profiling
  6. Start clicking the button really fast a bunch of times. Maybe for 5-10 seconds.
  7. Stop the profiler quickly after the last button press.
  8. Check the Timings tab

It doesn't happen consistently so you may have to do steps 5-8 a few times to reproduce the issue

Results

You can see the Calling Lifecycle Methods timing block spans almost the entire width of the profile and is some absurd duration like 5.4s. You will likely see more accurate timing blocks interspersed that have more accurate timings (<1ms)

Screenshot of Results