All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=757356

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=412e5938c4d50e611b7bec7ee6bf23e7751870965f578204803e387504ef7296


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

chromium-rel-win7-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8970667380655036096

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8970667364990207616

=== 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    : speedometer2
  Metric       : Total/Speedometer2
  Change       : 4.86% | 6198.03525 -> 6499.363

Revision             Result                  N
chromium@495791      6198.04 +- 153.546      6      good
chromium@495800      6142.48 +- 84.8849      6      good
chromium@495801      6142.19 +- 51.3311      6      good
chromium@495802      6544.05 +- 71.272       6      bad       <--
chromium@495804      6520.39 +- 117.893      6      bad
chromium@495808      6499.36 +- 164.108      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=Speedometer2 speedometer2

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8970667364990207616


For feedback, file a bug with component Speed>Bisection

=== 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    : speedometer2
  Metric       : Total/Speedometer2
  Change       : 5.27% | 6254.17625 -> 6583.59283333

Revision             Result                  N
chromium@495791      6254.18 +- 68.0566      6      good
chromium@495800      6263.17 +- 55.9643      6      good
chromium@495801      6260.86 +- 63.9477      6      good
chromium@495802      6567.46 +- 98.7171      6      bad       <--
chromium@495804      6571.69 +- 65.0867      6      bad
chromium@495808      6583.59 +- 83.0681      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=Speedometer2 speedometer2

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8970667380655036096


For feedback, file a bug with component Speed>Bisection