All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=788374

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=024221ace8fc36dd3786b8390f066c7e44201a0f3ce859cddf842d374c9f4d3d


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

chromium-rel-win10

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962042316111504832

=== Auto-CCing suspected CL author lfg@chromium.org ===

Hi lfg@chromium.org, the bisect results pointed to your CL, please take a look at the
results.


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

Suspected Commit
  Author : Lucas Furukawa Gadani
  Commit : ae0cbcc677ab761dbfee37fe1b4b3432964d8bfa
  Date   : Thu Nov 16 20:58:41 2017
  Subject: Remove dead code from SegmentedString.

Bisect Details
  Configuration: winx64_10_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/tough_canvas_cases_canvas2d_balls_common_bouncing_balls.html?ball_text_back_white_ball_count_15
  Change       : 4.63% | 16.6854027809 -> 17.312708692

Revision             Result                   N
chromium@517167      16.6854 +- 1.02383       14      good
chromium@517174      16.6628 +- 0.497598      14      good
chromium@517179      16.6592 +- 0.489055      14      good
chromium@517181      16.6815 +- 0.643522      14      good
chromium@517182      17.1618 +- 2.75122       14      bad       <--
chromium@517197      17.056 +- 0.615513       6       bad
chromium@517228      17.3127 +- 0.611478      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=tough.canvas.cases.canvas2d.balls.common.bouncing.balls.html.ball.text.back.white.ball.count.15 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/8962042316111504832


For feedback, file a bug with component Speed>Bisection

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962029396486989472

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

Suspected Commit
  Author : Alexandr Ilin
  Commit : 698e803c4335c3e9429f580851a580b18e7daef0
  Date   : Thu Nov 16 21:07:36 2017
  Subject: Revert "Enable SpeculativePreconnect Field Trial Testing"

Bisect Details
  Configuration: winx64_10_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/tough_canvas_cases_canvas2d_balls_common_bouncing_balls.html?ball_text_back_white_ball_count_15
  Change       : 0.95% | 16.6443851961 -> 16.8031320985

Revision             Result                   N
chromium@517167      16.6444 +- 0.41589       14      good
chromium@517182      16.6704 +- 0.571171      9       good
chromium@517190      16.6621 +- 0.529273      14      good
chromium@517191      16.8307 +- 0.615263      14      bad       <--
chromium@517192      16.8867 +- 0.507316      9       bad
chromium@517194      16.838 +- 0.416033       9       bad
chromium@517197      16.8155 +- 0.185215      9       bad
chromium@517228      16.8031 +- 0.273715      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=tough.canvas.cases.canvas2d.balls.common.bouncing.balls.html.ball.text.back.white.ball.count.15 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/8962029396486989472


For feedback, file a bug with component Speed>Bisection