All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=740532

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=46d2e884d3f4f8dc4cdfdf1f68c815e08c519f3875b791210c122055c88ce1f3


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

chromium-rel-mac11-air

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8974450504965039424

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

Suspected Commit
  Author : Yutaka Hirano
  Commit : 84047549ac37bab70d7306566c912e59131f3e1f
  Date   : Mon Jun 19 04:16:15 2017
  Subject: [Loading] Save one post-task when the data pipe is ready on arrival

Bisect Details
  Configuration: mac_air_perf_bisect
  Benchmark    : loading.desktop
  Metric       : timeToFirstMeaningfulPaint_avg/pcv1-cold/FarsNews
  Change       : 41.51% | 1137.84616667 -> 665.581833343

Revision             Result                  N
chromium@480312      1137.85 +- 324.497      6      good
chromium@480334      1138.43 +- 120.204      6      good
chromium@480340      1034.42 +- 243.84       6      good
chromium@480341      1124.65 +- 155.638      6      good
chromium@480342      678.687 +- 168.342      6      bad       <--
chromium@480343      636.815 +- 102.561      6      bad
chromium@480345      684.22 +- 116.131       6      bad
chromium@480356      665.582 +- 105.017      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=FarsNews loading.desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8974450504965039424


For feedback, file a bug with component Speed>Bisection