All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=784385

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=2580d1190ee6b83fb7183bbd1079679adc05446a0ed84e8d22c960736d4361f7


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

chromium-rel-mac11-air
chromium-rel-win7-gpu-intel

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/12803219f80000

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/12803219f80000

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963028449796088624

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

Suspected Commit
  Author : Alexandr Ilin
  Commit : e378a8f40efd70f0f138f16eb4a14a290261da86
  Date   : Fri Nov 10 07:54:20 2017
  Subject: Enable SpeculativePreconnect Field Trial Testing

Bisect Details
  Configuration: winx64intel_perf_bisect
  Benchmark    : loading.desktop
  Metric       : timeToFirstContentfulPaint_avg/cold/Mercadolivre
  Change       : 4.46% | 455.449777777 -> 435.131222222

Revision             Result                  N
chromium@515490      455.45 +- 645.465       9      good
chromium@515497      385.947 +- 34.6005      6      good
chromium@515501      381.102 +- 14.8382      6      good
chromium@515502      433.413 +- 74.0802      6      bad       <--
chromium@515503      468.147 +- 310.466      6      bad
chromium@515504      453.3 +- 179.042        9      bad
chromium@515518      428.15 +- 97.8215       9      bad
chromium@515545      437.858 +- 110.018      9      bad
chromium@515599      450.151 +- 177.255      9      bad
chromium@515708      435.131 +- 71.7311      9      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=Mercadolivre loading.desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8963028449796088624


For feedback, file a bug with component Speed>Bisection