All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=747861

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=dfb458e531c3b15975c4ee40df90dbd02bf72c843c6bbb3c2319ab4cbd3f0676


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

chromium-rel-win7-gpu-intel

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8973194051698316000

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

Suspected Commit
  Author : Daniel Vogelheim
  Commit : 5578c07d877cb8bf3ee41439ea1c8ff9c0dd7394
  Date   : Fri Jul 21 14:03:19 2017
  Subject: ScriptRunner can initiate script streaming.

Bisect Details
  Configuration: winx64intel_perf_bisect
  Benchmark    : loading.desktop
  Metric       : timeToFirstContentfulPaint_avg/pcv1-warm/NatGeo
  Change       : 146.52% | 344.041999996 -> 848.127333333

Revision             Result                  N
chromium@488622      344.042 +- 5.68225      6      good
chromium@488639      340.862 +- 7.77215      6      good
chromium@488647      343.333 +- 4.25833      6      good
chromium@488648      837.884 +- 43.8248      6      bad       <--
chromium@488649      823.732 +- 28.6354      6      bad
chromium@488651      742.048 +- 437.055      6      bad
chromium@488655      848.127 +- 125.551      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=NatGeo loading.desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8973194051698316000


For feedback, file a bug with component Speed>Bisection