All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=753650

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=b84f86b828b54a769b41fd5eba1d900f1710e7544f5290086828c893f23c00c1


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

chromium-rel-mac11
chromium-rel-mac11-pro
chromium-rel-mac12
chromium-rel-mac12-mini-8gb
chromium-rel-win10
chromium-rel-win7-dual
chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia
chromium-rel-win7-x64-dual
chromium-rel-win8-dual
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8971771419888746864

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

Suspected Commit
  Author : xunjieli
  Commit : 357e1deefca78c61e457f340270c9cd6f38321f5
  Date   : Thu Aug 03 22:16:30 2017
  Subject: [wpr-go] Use a dummy cert if no cert is recorded

Bisect Details
  Configuration: winx64intel_perf_bisect
  Benchmark    : system_health.common_desktop
  Metric       : cpu_time_percentage_avg/load_tools/load_tools_weather
  Change       : 743.66% | 0.0333812209278 -> 0.281625260378

Revision                                 Result                       N
chromium@491880                          0.0333812 +- 0.007536        6      good
chromium@491920                          0.033242 +- 0.00631369       6      good
chromium@491923                          0.0348807 +- 0.00437135      6      good
chromium@491924                          0.0319906 +- 0.00416682      6      good
chromium@491924,catapult@b0f1e24d46      0.0339957 +- 0.00553108      6      good
chromium@491924,catapult@357e1deefc      0.28052 +- 0.133538          6      bad       <--
chromium@491925                          0.28877 +- 0.0900929         6      bad
chromium@491930                          0.270942 +- 0.132177         6      bad
chromium@491940                          0.27609 +- 0.141525          6      bad
chromium@491959                          0.281625 +- 0.117323         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=load.tools.weather system_health.common_desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8971771419888746864


For feedback, file a bug with component Speed>Bisection