All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=760159

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=5a6c874e1de362371997959f3259771068c230c1f41b0d8e36f2009792a7f7ea


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

chromium-rel-win7-dual
chromium-rel-win7-gpu-intel
chromium-rel-win7-x64-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8969912383635241152

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

Suspected Commit
  Author : Nico Weber
  Commit : 7cd2f6bd73c6a9c6200704e995b18ebb3168ead6
  Date   : Sat Aug 19 04:23:54 2017
  Subject: win: Turn off clang-by-default again for now.

Bisect Details
  Configuration: win_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/http___ie.microsoft.com_testdrive_Performance_SpeedReading_Default.html
  Change       : 43.77% | 30.516681245 -> 43.8736289886

Revision             Result                   N
chromium@495791      30.5167 +- 0.593944      6      good
chromium@495800      30.3889 +- 0.688966      6      good
chromium@495801      30.6299 +- 1.04776       6      good
chromium@495802      44.5289 +- 3.30348       6      bad       <--
chromium@495804      45.4996 +- 6.73769       6      bad
chromium@495808      43.8736 +- 1.49615       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=http...ie.microsoft.com.testdrive.Performance.SpeedReading.Default.html 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/8969912383635241152


For feedback, file a bug with component Speed>Bisection