Closed Bug 1498615 Opened Last year Closed Last year

3.6 - 8.62% sessionrestore / sessionrestore_no_auto_restore / tps (linux64, linux64-qr, windows10-64, windows10-64-qr, windows7-32) regression on push 90b00e89e83e5eb07baf20dc55a8a141d8f242af (Fri Oct 12 2018)


(Web Compatibility :: Tooling & Investigations, defect)

Not set


(Not tracked)



(Reporter: igoldan, Unassigned)


(Blocks 1 open bug)


(Keywords: perf, regression, talos-regression)

Talos has detected a Firefox performance regression from push:

As author of one of the patches included in that push, we need your help to address this regression.


  9%  tps linux64 pgo e10s stylo                                        9.61 -> 10.44
  6%  sessionrestore linux64 pgo e10s stylo                             295.04 -> 313.50
  6%  sessionrestore windows10-64 pgo e10s stylo                        281.75 -> 298.17
  6%  sessionrestore windows10-64 opt e10s stylo                        309.25 -> 327.25
  5%  sessionrestore windows7-32 pgo e10s stylo                         290.75 -> 305.75
  5%  sessionrestore_no_auto_restore windows10-64 opt e10s stylo        332.08 -> 349.00
  5%  sessionrestore_no_auto_restore windows10-64-qr opt e10s stylo     335.12 -> 352.08
  5%  tps linux64-qr opt e10s stylo                                     9.22 -> 9.67
  5%  tps windows10-64 opt e10s stylo                                   10.83 -> 11.35
  5%  sessionrestore linux64 opt e10s stylo                             323.17 -> 338.50
  5%  sessionrestore windows10-64-qr opt e10s stylo                     317.12 -> 331.75
  5%  sessionrestore_no_auto_restore windows10-64 pgo e10s stylo        304.67 -> 318.58
  4%  sessionrestore_no_auto_restore linux64 opt e10s stylo             340.79 -> 355.42
  4%  sessionrestore_no_auto_restore linux64 pgo e10s stylo             316.92 -> 330.00
  4%  sessionrestore_no_auto_restore windows7-32 pgo e10s stylo         310.58 -> 323.25
  4%  sessionrestore_no_auto_restore windows7-32 opt e10s stylo         335.17 -> 348.00
  4%  sessionrestore windows7-32 opt e10s stylo                         317.08 -> 328.50

You can find links to graphs and comparison views for each of the above tests at:

On the page above you can see an alert for each affected platform as well as a link to a graph showing the history of scores for this test. There is also a link to a treeherder page showing the Talos jobs in a pushlog format.

To learn more about the regressing test(s), please see:

For information on reproducing and debugging the regression, either on try or locally, see:

*** Please let us know your plans within 3 business days, or the offending patch(es) will be backed out! ***

Our wiki page outlines the common responses and expectations:
Product: Testing → Web Compatibility Tools
This is the result of converting out bootstrap addon to a WebExtension. We hope to make improvements in the beta cycle, but it's possible this is the new cost of business for system addons.
Closed: Last year
Resolution: --- → WONTFIX
For the record, I think we recovered most of the sessionrestore regressions here:
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