1462956 - Firefox slows the Windows Desktop with 100% CPU

Status: RESOLVED FIXED

(Core :: Disability Access APIs, defect)

Description

[Kaz Nishimura]

Attachment: Firefox 2018-05-20 11.04 profile.sps.json.gz

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0
Build ID: 20180516032328

Steps to reproduce:

Open a new tab.


Actual results:

Firefox and the entire Desktop becomes very slow for a few minutes on one of my PCs.  While the Desktop is slow, a Firefox process is consuming nearly 100% CPU on the task manager listing.


Expected results:

A new tab should appear in a few seconds.

Comment 1

[Kaz Nishimura]

The attachment is a performance profile recorded after Firefox started with a new window.  I used a new profile only with the Profiler Add-on.

The profile is also available at https://perfht.ml/2KBqtji

Comment 2

[Daniel_A[:daschilean] [Please contact - [e-mail]]]

I verified this issue on Windows 10 X64 with the latest Firefox 60.0.1 (64-bit) and I cannot reproduce it after following your steps.  
Did you record the profile on FF Nightly? If not please install FF Nightly from here: https://ftp.mozilla.org/pub/firefox/releases/60.0.1/win64/en-US/ and record the performance profile. You need to record the profile on Nightly because if there is a problem it will be more visible on this version.

Comment 3

[[:philipp]]

hi, looks like a performance issue that's related to accessibility. could you post the contents of your about:support page here as well?
as a workaround you could try disabling accessibility in firefox: https://support.mozilla.org/en-US/kb/accessibility-services#w_how-do-i-disable-firefox-accessibility-service

Comment 4

[Kaz Nishimura]

(In reply to Daniel_A from comment #2)
> I verified this issue on Windows 10 X64 with the latest Firefox 60.0.1
> (64-bit) and I cannot reproduce it after following your steps.  
> Did you record the profile on FF Nightly? If not please install FF Nightly
> from here: https://ftp.mozilla.org/pub/firefox/releases/60.0.1/win64/en-US/
> and record the performance profile. You need to record the profile on
> Nightly because if there is a problem it will be more visible on this
> version.

Nightly showed no such problems at first sight.

Comment 5

[Kaz Nishimura]

(In reply to [:philipp] from comment #3)
> hi, looks like a performance issue that's related to accessibility. could
> you post the contents of your about:support page here as well?
> as a workaround you could try disabling accessibility in firefox:
> https://support.mozilla.org/en-US/kb/accessibility-services#w_how-do-i-
> disable-firefox-accessibility-service


{
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    "version": "60.0.1",
    "buildID": "20180516032328",
    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0",
    "safeMode": false,
    "updateChannel": "release",
    "supportURL": "https://support.mozilla.org/1/firefox/60.0.1/WINNT/ja/",
    "numTotalWindows": 1,
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    "remoteAutoStart": true,
    "currentContentProcesses": 3,
    "maxContentProcesses": 4,
    "autoStartStatus": 1,
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    "styloDefault": true,
    "styloResult": true,
    "styloChromeDefault": true,
    "styloChromeResult": true,
    "policiesStatus": 0,
    "keyGoogleFound": true,
    "keyMozillaFound": true
  },
  "securitySoftware": {
    "registeredAntiVirus": "マカフィー  ウイルススキャン",
    "registeredAntiSpyware": "マカフィー  ウイルススキャン",
    "registeredFirewall": "マカフィー ファイアウォール"
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}

Comment 6

[Kaz Nishimura]

(In reply to [:philipp] from comment #3)
> hi, looks like a performance issue that's related to accessibility. could
> you post the contents of your about:support page here as well?
> as a workaround you could try disabling accessibility in firefox:
> https://support.mozilla.org/en-US/kb/accessibility-services#w_how-do-i-
> disable-firefox-accessibility-service

Looks like disabling accessibility solved the problem.

Thank you.

Comment 7

[Daniel_A[:daschilean] [Please contact - [e-mail]]]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0
Build ID: 20180603221731
I manage to reproduce this issue on Windows 10 x64 with the FF 62.0a1(2018-06-03) (64bit).  Here you can check the performance profile result: https://perfht.ml/2JqUWU9.

Comment 8

[James Teh [:Jamie]]

This should be resolved by Cache the World, which is enabled by default in Firefox 113.