All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=778179

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=cf053263f2475ea2f8be464625866cd3afd253631acfbdd14e186274e0f338af


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

chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8964767906244810096

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

Suspected Commit
  Author : Hans Wennborg
  Commit : 22525134c75ca2a005997a717f6887a23af86210
  Date   : Mon Oct 23 17:10:25 2017
  Subject: win: Re-enable Clang by default

Bisect Details
  Configuration: win_8_perf_bisect
  Benchmark    : smoothness.gpu_rasterization.tough_filters_cases
  Metric       : frame_times/Filter Terrain SVG
  Change       : 3.58% | 43.9433193918 -> 42.3686658278

Revision             Result                   N
chromium@510776      43.9433 +- 0.494879      6      good
chromium@510813      43.9284 +- 0.478026      6      good
chromium@510822      43.8439 +- 0.609313      6      good
chromium@510823      43.6699 +- 0.536283      6      good
chromium@510824      42.0362 +- 0.494731      6      bad       <--
chromium@510825      42.1109 +- 0.493374      6      bad
chromium@510827      42.0296 +- 0.653689      6      bad
chromium@510831      42.2834 +- 0.422889      6      bad
chromium@510849      42.3687 +- 0.374257      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=Filter.Terrain.SVG smoothness.gpu_rasterization.tough_filters_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8964767906244810096


For feedback, file a bug with component Speed>Bisection