All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=762275

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=79bf0f503619451568d711664641c6692c2fd4460a5acef6acd06eae9c260b9f


Bot(s) for this bug's original alert(s):

chromium-rel-mac-retina

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8969252838789579280

=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : Robert Sesek
  Commit : 5cd8eef498e28e1aacb9109645c001bbbfe1bc26
  Date   : Mon Aug 28 19:51:25 2017
  Subject: [Mac] A potential fix for WaitableEvent::WaitMany on macOS 10.11.

Bisect Details
  Configuration: mac_retina_perf_bisect
  Benchmark    : smoothness.top_25_smooth
  Metric       : first_gesture_scroll_update_latency/Wordpress
  Change       : 14.74% | 2.86955555556 -> 3.29266666667

Revision             Result                   N
chromium@497780      2.86956 +- 1.02215       9       good
chromium@497839      2.99693 +- 0.570264      14      good
chromium@497847      2.88556 +- 0.457806      9       good
chromium@497849      2.95967 +- 0.451167      9       good
chromium@497850      3.28579 +- 0.753972      14      bad       <--
chromium@497851      3.29656 +- 0.417344      9       bad
chromium@497854      3.28789 +- 0.523283      9       bad
chromium@497869      3.20693 +- 0.667265      14      bad
chromium@497898      3.29267 +- 0.492012      9       bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=Wordpress smoothness.top_25_smooth

More information on addressing performance regressions:
  http://g.co/ChromePerformanceRegressions

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8969252838789579280


For feedback, file a bug with component Speed>Bisection