All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=757319

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=583c35dc8058d250b590692dd7c412875df1fd526d130814ea974d6d23ca1c2d


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

chromium-rel-mac-retina
chromium-rel-mac11
chromium-rel-win10
chromium-rel-win7-dual
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/8970676380262322064

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

Suspected Commit
  Author : Fredrik Hubinette
  Commit : 46c25f4aeea8ba4487d9104b0b7034c40631cbec
  Date   : Sat Aug 12 00:27:30 2017
  Subject: Revert "Add test and fixes for loading many videos on the same page."

Bisect Details
  Configuration: mac_10_11_perf_bisect
  Benchmark    : media.tough_video_cases_tbmv2
  Metric       : cpu_time_percentage_avg/video.html?src_garden2_10s.mp4_seek
  Change       : 50.91% | 0.522044146706 -> 0.787828741007

Revision             Result                     N
chromium@493879      0.522044 +- 0.130473       6      good
chromium@493890      0.499235 +- 0.0452506      6      good
chromium@493896      0.494377 +- 0.0412471      6      good
chromium@493897      0.782541 +- 0.116728       6      bad       <--
chromium@493898      0.775664 +- 0.0981855      6      bad
chromium@493899      0.777239 +- 0.0750253      6      bad
chromium@493901      0.783002 +- 0.132004       6      bad
chromium@493922      0.780492 +- 0.0688477      6      bad
chromium@493964      0.787829 +- 0.134303       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=video.html.src.garden2.10s.mp4.seek media.tough_video_cases_tbmv2

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8970676380262322064


For feedback, file a bug with component Speed>Bisection