All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=784410

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=c22879ab5b35ef4b1b5488d9894e82873faece2332ebfb65f48a6eda811bb0fa


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

win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963025458823952864

=== 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: winx64_high_dpi_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/http___geoapis.appspot.com_agdnZW9hcGlzchMLEgtFeGFtcGxlQ29kZRjh1wIM
  Change       : 25.00% | 42.3653055555 -> 52.9562916667

Revision             Result                   N
chromium@515373      42.3653 +- 11.1027       6      good
chromium@515441      40.5864 +- 0.386935      6      good
chromium@515475      40.354 +- 0.85345        6      good
chromium@515492      42.3134 +- 10.9297       6      good
chromium@515501      41.7935 +- 6.88318       6      good
chromium@515502      52.4394 +- 0.479191      6      bad       <--
chromium@515503      52.5739 +- 1.87664       6      bad
chromium@515505      52.517 +- 0.787346       6      bad
chromium@515509      52.9563 +- 1.28977       6      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=http...geoapis.appspot.com.agdnZW9hcGlzchMLEgtFeGFtcGxlQ29kZRjh1wIM smoothness.tough_canvas_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8963025458823952864


For feedback, file a bug with component Speed>Bisection