All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=783675

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=c60801f27ebc594dd0445719338c499c45c27d95ac7688ce2e474a10bb597623


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

android-nexus7v2
chromium-rel-win10
chromium-rel-win7-dual
chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963319847011763808

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 6bb1d47e6e82f75ead36cdab209afc5dafa8329c
  Date   : Tue Nov 07 13:11:10 2017
  Subject: [heap] Re-enable concurrent marking.

Bisect Details
  Configuration: winx64_10_perf_bisect
  Benchmark    : thread_times.tough_compositor_cases
  Metric       : tasks_per_frame_other/tasks_per_frame_other
  Change       : 22.32% | 0.199681677308 -> 0.244255647257

Revision                           Result                      N
chromium@514641                    0.199682 +- 0.00479164      6      good
chromium@514641,v8@67d543ec31      0.201437 +- 0.00629875      6      good
chromium@514641,v8@6bb1d47e6e      0.244656 +- 0.00693063      6      bad       <--
chromium@514641,v8@ac0661b358      0.243491 +- 0.023478        6      bad
chromium@514641,v8@80cb266c75      0.244066 +- 0.00992437      6      bad
chromium@514642                    0.243872 +- 0.0242369       6      bad
chromium@514643                    0.241733 +- 0.0223277       6      bad
chromium@514644                    0.246382 +- 0.00857566      6      bad
chromium@514647                    0.239139 +- 0.0154911       6      bad
chromium@514653                    0.242148 +- 0.0155495       6      bad
chromium@514665                    0.243059 +- 0.0218254       6      bad
chromium@514688                    0.244143 +- 0.0138953       6      bad
chromium@514734                    0.244256 +- 0.0127197       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 thread_times.tough_compositor_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8963319847011763808


For feedback, file a bug with component Speed>Bisection