1435631 - Unloaded page loading can be extremely slow.

Status: RESOLVED DUPLICATE of bug 1441431

(Firefox :: Tabbed Browser, defect)

Description

[Preston]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0
Build ID: 20180204102054

Steps to reproduce:

Use one tab, then switch to another page, use it for a bit, then switch back. I have the following addons:
Themes:
Firefox Quantum Nightly
Dark (Disabled)
Default (Disabled)
FFX Nightly (Disabled)
Light (Disabled)

Plugins:
OpenH264 Video Codec provided by Cisco Systems, Inc.
Widevine Content Decryption Module provided by Google Inc.
Shockwave Flash

Extensions:
CaretTab - New Tab Clock and Date
Enhancer for Youtube
Gecko Profiler
Grammarly for Firefox
McAfee WebAdvisor
True Key by Intel Security
uBlock Origin
Youtube Dark Purple


Actual results:

About half the time, the page will be blank besides a loading wheel in the middle for a few seconds, then will slowly load the page.


Expected results:

Should've loaded almost instantly.

Comment 1

[Alex Thayer [:alexical] (she/her)]

Preston could you record a profile where this is occurring? (Navigate to https://perf-html.io/, download the profiler add-on that it links to, and follow its instructions. And let me know if you need any more information!)

Comment 2

[Preston]

This problem has disappeared, as well as a few others, once I got rid of Grammarly for Firefox and True Key by Intel Security.

I had reported another bug and in there we narrowed it down to those two extensions. Here are the links to the profiles and the actual bug report:

First Bug Report: https://bugzilla.mozilla.org/show_bug.cgi?id=1434850
Initial performance profile: https://perfht.ml/2EvwXy3
Performance profile with True Key disabled: https://perfht.ml/2FRGQWv
Performance profile with True Key and Grammarly Disabled: https://perfht.ml/2H5Qwhp
True Key Bug Report: https://bugzilla.mozilla.org/show_bug.cgi?id=1441431
Grammarly Bug Report: https://bugzilla.mozilla.org/show_bug.cgi?id=1441429

True Key as of now isn't in the actual addon store. I had to download it from the website. I don't know if there is support/optimization for it yet in Firefox Quantum.

Thanks!