1382814 - [Netflix] Very long page load (50s+)

Status: RESOLVED DUPLICATE of bug 1374797

(Core :: JavaScript Engine, defect)

Description

[Ted Campbell [:tcampbell]]

My machine has started having serious problems loading Netflix recently. I'm unsure if this is a change on their end.

Here is an example of pause, with almost all time spent in GC.
https://perfht.ml/2uNfSO6

Looking at bisections, I see particularly bad behavior around 2017-05-24 nightly. Near then the STR that triggers for me are:
  - Use ./mach mozgression to load a clean profile. This loads 2 or 3 default tabs.
  - Create new tab and navigate to netflix.com and sign-in
  - Switch to first tab (welcome to nightly) and navigate to netflix.com
  - Switch to second tab and navigate to netflix.com

One of these loads (sometimes I have to do a few more) will hang for roughly 50s with 95% of activity in garbage collection.

In current nightlies, it does not reproduce as often, but having other tabs such as gmail and irccloud open first increases the chance of it happening significantly.

I'm using 32-bit nightly on 64-bit Win10 machine.

Comment 1

[Guilherme Lima]

Dupe of bug 1374797?

Comment 2

[Ted Campbell [:tcampbell]]

Thanks for the tip. It looks very similar (long series of back-to-back GCs).

Comment 4

[Jon Coppeard (:jonco)]

Thanks for the report!

Comment 5

[Ted Campbell [:tcampbell]]

Ignore that bisect range. I had false negatives. I'm able to see this behavior going back months in nightly.