All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=760171

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=f009685394d1a8dd3230144ff9c40e95e3bb02035053304aadceee94d7406722


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

chromium-rel-mac-retina
chromium-rel-mac12
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8969912221086847056

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

Suspected Commit
  Author : Pavel Feldman
  Commit : 9ce7836fdec98fde42fc61347c4161077dbea0fc
  Date   : Wed Aug 23 07:07:21 2017
  Subject: DevTools: introduce lifecycle events reported over the page domain.

Bisect Details
  Configuration: mac_10_12_perf_bisect
  Benchmark    : loading.desktop
  Metric       : timeToFirstMeaningfulPaint_avg/pcv1-warm/Aljayyash
  Change       : 34.27% | 311.352833333 -> 418.042

Revision             Result                  N
chromium@496588      311.353 +- 2.30538      6      good
chromium@496600      313.525 +- 4.68122      6      good
chromium@496606      318.3 +- 13.1147        6      good
chromium@496607      419.053 +- 4.66171      6      bad       <--
chromium@496608      415.119 +- 10.4605      6      bad
chromium@496609      414.025 +- 4.37679      6      bad
chromium@496612      418.961 +- 12.3535      6      bad
chromium@496636      418.042 +- 36.2063      6      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=Aljayyash loading.desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8969912221086847056


For feedback, file a bug with component Speed>Bisection