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Firefox is unbearably slow after updating to version 27

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After updating to Firefox 27 all webpages take a few dozen seconds to several minutes to load. When loading a webpage Firefox's status displays "connecting" and the CPU gets maxed out with 95 to 100% of its cycles taking by Firefox.

The computer is older so it is a little slow but Internet Explorer 8 has no trouble opening the webpages and neither do other computers on the LAN so it is not a network issue. I have tried restarting Firefox, disabling add-ons, deleting add-ons, disabling hardware acceleration, restarting the computer, and reinstalling Firefox after wiping every trace of it and its user data from the hard drive and registry.

CPU: AMD Athlon 2800+ 2.08GHz RAM: 1GB OS: Windows XP Home Edition Service Pack 3 32bit


Comments by a forum moderator.
(Modified April 30, 2014 12:11:58 PM BST by John99 ) ~J99
Rather a long thread so I will add some comments here where easily seen.

 Modified June 18, 2014 6:08:41 AM PDT by John99

After updating to Firefox 27 all webpages take a few dozen seconds to several minutes to load. When loading a webpage Firefox's status displays "connecting" and the CPU gets maxed out with 95 to 100% of its cycles taking by Firefox. The computer is older so it is a little slow but Internet Explorer 8 has no trouble opening the webpages and neither do other computers on the LAN so it is not a network issue. I have tried restarting Firefox, disabling add-ons, deleting add-ons, disabling hardware acceleration, restarting the computer, and reinstalling Firefox after wiping every trace of it and its user data from the hard drive and registry. CPU: AMD Athlon 2800+ 2.08GHz RAM: 1GB OS: Windows XP Home Edition Service Pack 3 32bit ------------ <u>Comments by a forum moderator.</u> <br / > (Modified April 30, 2014 12:11:58 PM BST by John99 ) ~J99 <br /> Rather a long thread so I will add some comments here where easily seen. * For general problems please see my post [/questions/985969?page=3#answer-546520] <br /> Updated 30th April 2014 to mention the outstanding known issue (aka the bug with only three votes) * Just below that ''jigebren'' has kindly summarised some workarounds at that particular time and the issues found from this thread [/questions/985969?page=3#answer-546599] Modified June 18, 2014 6:08:41 AM PDT by John99 ------------- * Workaround, <br /> A chrome hack to disable the throbber may resolve the issue as a workaround allowing pages to load quickly. See my post [/questions/985969?page=4#answer-595327]

Ændret af John99 den

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Installerede plugins

  • Shockwave Flash 12.0 r0
  • 5.1.20913.0
  • VLC media player Web Plugin 2.0.6
  • Adobe Shockwave for Director Netscape plug-in, version 12.0.2.122
  • The plug-in allows you to open and edit files using Microsoft Office applications
  • Office Authorization plug-in for NPAPI browsers
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • DRM Netscape Network Object
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  • DRM Store Netscape Plugin

Program

  • Firefox 27.0
  • User Agent: Mozilla/5.0 (Windows NT 5.1; rv:27.0) Gecko/20100101 Firefox/27.0
  • Support-URL: https://support.mozilla.org/1/firefox/27.0/WINNT/en-US/

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  • Adblock Edge 2.0.9 ({fe272bd1-5f76-4ea4-8501-a05d35d823fc})
  • Self-Destructing Cookies 0.4.2 (jid0-9XfBwUWnvPx4wWsfBWMCm4Jj69E@jetpack)
  • Troubleshooter 1.1a (troubleshooter@mozilla.org)
  • Microsoft .NET Framework Assistant 0.0.0 ({20a82645-c095-46ed-80e3-08825760534b}) (Inactive)

Javascript

  • incrementalGCEnabled: True

Grafik

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  • adapterDescription2:
  • adapterDeviceID: 0x5159
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  • adapterDrivers: ati2dvag
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  • direct2DEnabledMessage: [u'tryNewerDriver', u'10.6']
  • directWriteEnabled: False
  • directWriteVersion: 0.0.0.0
  • driverDate: 5-3-2006
  • driverDate2:
  • driverVersion: 8.252.0.0
  • driverVersion2:
  • info: {u'AzureContentBackend': u'cairo', u'AzureCanvasBackend': u'skia', u'AzureFallbackCanvasBackend': u'cairo', u'AzureSkiaAccelerated': 0}
  • isGPU2Active: False
  • numAcceleratedWindows: 0
  • numAcceleratedWindowsMessage: [u'tryNewerDriver', u'9.6']
  • numTotalWindows: 1
  • webglRendererMessage: [u'tryNewerDriver', u'9.6']
  • windowLayerManagerRemote: False
  • windowLayerManagerType: Basic

Ændrede indstillinger

  • browser.cache.disk.capacity: 358400
  • browser.cache.disk.smart_size.first_run: False
  • browser.cache.disk.smart_size.use_old_max: False
  • browser.cache.disk.smart_size_cached_value: 358400
  • browser.places.smartBookmarksVersion: 4
  • browser.sessionstore.upgradeBackup.latestBuildID: 20140127194636
  • browser.startup.homepage: https://duckduckgo.com/
  • browser.startup.homepage_override.buildID: 20140127194636
  • browser.startup.homepage_override.mstone: 27.0
  • dom.mozApps.used: True
  • extensions.lastAppVersion: 27.0
  • gfx.direct2d.disabled: True
  • layers.acceleration.disabled: True
  • network.cookie.prefsMigrated: True
  • places.database.lastMaintenance: 1391983052
  • places.history.expiration.transient_current_max_pages: 26831
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • plugin.importedState: True
  • privacy.sanitize.migrateFx3Prefs: True
  • storage.vacuum.last.index: 0
  • storage.vacuum.last.places.sqlite: 1391983052

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Luk
Leacroft 0 løsninger 2 svar

A whole day wasted with re-installs, modifying start-ups, safe mode, restores etc. on a very old XP machine which just sat with arrow spinning on half the sites. Given up then found this about cairo. Sorted in a couple of clicks and now all back to perfect. Obviously something very wrong in 27.

Thank you very much Jigebren for this!!

A whole day wasted with re-installs, modifying start-ups, safe mode, restores etc. on a very old XP machine which just sat with arrow spinning on half the sites. Given up then found this about cairo. Sorted in a couple of clicks and now all back to perfect. Obviously something very wrong in 27. Thank you very much Jigebren for this!!
jscher2000
  • Top 10 Contributor
8799 løsninger 71970 svar

Did anyone try disabling Azure instead of editing the "backend" preference?

(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(2) In the search box above the list, type or paste gfx and pause while the list is filtered

(3) Double-click the gfx.content.azure.enabled preference to switch it from true to false.

Did anyone try disabling Azure instead of editing the "backend" preference? (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful. (2) In the search box above the list, type or paste '''gfx''' and pause while the list is filtered (3) Double-click the '''gfx.content.azure.enabled''' preference to switch it from true to false.
jigebren 0 løsninger 7 svar

@jscher2000 - Just tried to disable via gfx.content.azure.enabled and it works too, indeed.

Would you actually recommend disabling Azure when only the backend setting is the issue?

@jscher2000 - Just tried to disable via '''gfx.content.azure.enabled''' and it works too, indeed. Would you actually recommend disabling Azure when only the backend setting is the issue?
jscher2000
  • Top 10 Contributor
8799 løsninger 71970 svar

Hi jigebren, I think the back ends are listed in the order from most preferred to least preferred. If for one reason or another Direct2D is not available, then Cairo is used. If you delete Cairo in that case, then Azure can't run, so I think it works out the same. But from the perspective of understanding what's going on in Firefox, it may be easier to remember what you changed and undo the change if you switch enabled between true and false.

Hi jigebren, I think the back ends are listed in the order from most preferred to least preferred. If for one reason or another Direct2D is not available, then Cairo is used. If you delete Cairo in that case, then Azure can't run, so I think it works out the same. But from the perspective of understanding what's going on in Firefox, it may be easier to remember what you changed and undo the change if you switch enabled between true and false.
cor-el
  • Top 10 Contributor
  • Moderator
17588 løsninger 159105 svar

Note that support for gfx.content.azure.enabled is removed in Firefox 28 and later (Bug 934533).

Note that support for gfx.content.azure.enabled is removed in Firefox 28 and later (Bug 934533).
baszermaszer 0 løsninger 1 svar

@jigebren OMG, you did it!! Mozilla devs should ditch this Cairo Crap it makes browsers unbearably slooOOooOoOoOoowwWWwww

Wait... wait.. SllsooooOOooOOOoooWW.

Switching back to lovely Direct2D did a fantastic job. Good work and thank you, jigebren!

@jigebren '''OMG, you did it!!''' Mozilla devs should ditch this '''Cairo Crap''' it makes browsers unbearably slooOOooOoOoOoowwWWwww Wait... wait.. SllsooooOOooOOOoooWW. Switching back to lovely Direct2D did a fantastic job. Good work and thank you, jigebren!
jigebren 0 løsninger 7 svar

@jscher2000 - Out of curiosity, do you know what is used when "AzureContentBackend" is "none"? If it's neither Direct2D nor cairo, what does work for us then?

@cor-el - Thanks for the info, and that doesn't sound good. I just tried and though gfx.content.azure.enabled is actually no more in v28, gfx.content.azure.backends was still here. But apparently it no longer has any effect: in about:support, AzureContentBackend still displays cairo even with the workaround I'm using now.

I can not understand why they removed support for a property that can be used as a workaround for some issues before those issues are actually fixed up (if this property crashes Fx just don't use it then, disabling it is overkill - this is an advanced settings anyway).

Seems like we'll soon have to disable Fx update once again...

@jscher2000 - Out of curiosity, do you know what is used when "AzureContentBackend" is "none"? If it's neither Direct2D nor cairo, what does work for us then? @cor-el - Thanks for the info, and that doesn't sound good. I just tried and though gfx.content.azure.enabled is actually no more in v28, gfx.content.azure.backends was still here. But apparently it no longer has any effect: in about:support, AzureContentBackend still displays cairo even with the workaround I'm using now. I can not understand why they removed support for a property that can be used as a workaround for some issues before those issues are actually fixed up (if this property [https://bugzilla.mozilla.org/show_bug.cgi?id=934533 crashes Fx] just don't use it then, disabling it is overkill - this is an advanced settings anyway). Seems like we'll soon have to disable Fx update once again...
The_iGuru 0 løsninger 1 svar

I went looking around about:config and typed in gfx and noticed a BOLD faced line that I know I didn't change. I don't recall the full line as it seems to have disappeared after resetting the entry. I do know that i typed "gfx" there was a bold faced line and it said "LastUsed" something, and it ended with "_idx" and had a value set of "0" and after right clicking that and selecting "reset" it fixed the slow downs i was having with FIrefox 27.0.1 with Flash player 12.0.0.70 and it may fix it for other version combinations. It's the only thing I changed and I haven't had any issues since.

Let me know if this works for you guys.

I went looking around about:config and typed in gfx and noticed a BOLD faced line that I know I didn't change. I don't recall the full line as it seems to have disappeared after resetting the entry. I do know that i typed "gfx" there was a bold faced line and it said "LastUsed" something, and it ended with "_idx" and had a value set of "0" and after right clicking that and selecting "reset" it fixed the slow downs i was having with FIrefox 27.0.1 with Flash player 12.0.0.70 and it may fix it for other version combinations. It's the only thing I changed and I haven't had any issues since. Let me know if this works for you guys.
Halofromsue 1 løsninger 47 svar

Yes version 26 worked fine, 27 sucks terribly. I literally have to load, reload, reload EVERY single site I visit, even if its a common one like Facebook where I go to it a lot. SO TIRED of this. I'm not as PC smart as most here, so I'm trying to figure out how to roll back to version 26 and still keep all my bookmarks. Not even sure if it can be done.

This is depressing. I usually LOVE FF but not so much these days.

Yes version 26 worked fine, 27 sucks terribly. I literally have to load, reload, reload EVERY single site I visit, even if its a common one like Facebook where I go to it a lot. SO TIRED of this. I'm not as PC smart as most here, so I'm trying to figure out how to roll back to version 26 and still keep all my bookmarks. Not even sure if it can be done. This is depressing. I usually LOVE FF but not so much these days.
jscher2000
  • Top 10 Contributor
8799 løsninger 71970 svar

Hi Halofromsue, this article has a link to Firefox 26 if you visit using Firefox 27: Install an older version of Firefox. You may want to start a new question if problems continue.

Hi Halofromsue, this article has a link to Firefox 26 if you visit using Firefox 27: [[Install an older version of Firefox]]. You may want to start a new question if problems continue.
petef 4 løsninger 60 svar

jigebren Thank you, worked a treat.

Looking at other posts it seems this problem is being experienced by many people since v.27.

Is this likely to be sorted for v.28???? Else may go back to v.26.

'''''jigebren''''' Thank you, worked a treat. Looking at other posts it seems this problem is being experienced by many people since v.27. Is this likely to be sorted for v.28???? Else may go back to v.26.
BrokenEye 1 løsninger 70 svar

You know, this wouldn't be nearly as annoying if when I searched for a solution, half the results were press releases about how much "faster" 27 supposedly is, even though anyone with half a brain could tell that its slower. Way slower.

I still haven't decided if they're lying, or honestly don't know. Neither really inspires confidence.

You know, this wouldn't be nearly as annoying if when I searched for a solution, half the results were press releases about how much "faster" 27 supposedly is, even though anyone with half a brain could tell that its slower. ''Way'' slower. I still haven't decided if they're lying, or honestly don't know. Neither really inspires confidence.

Ændret af BrokenEye den

BrokenEye 1 løsninger 70 svar

@jigebren@ What are AzureContentBackend and cario, anyway? I don't want to disable something without knowing what it does.

@jigebren@ What are AzureContentBackend and cario, anyway? I don't want to disable something without knowing what it does.
billm4 0 løsninger 11 svar

An update from me:

  1. On my work PC, double-clicking the gfx.content.azure.enabled preference to switch it from true to false solved the slow down problem.
  2. On my home PC, this trick didn't work and Firefox was still painfully slow and hogged the CPU. However, I came across this post: SiteAdvisor and Firefox. Following the advice to disable the McAfee SiteAdvisor 3.6.5 add-on worked a treat, so I am up to speed now on my home PC as well. Apparently version 3.6.6 of SiteAdvisor is released next week – I'll see if that help things and report back.
An update from me: # On my work PC, double-clicking the gfx.content.azure.enabled preference to switch it from true to false solved the slow down problem. # On my home PC, this trick didn't work and Firefox was still painfully slow and hogged the CPU. However, I came across this post: [https://community.mcafee.com/thread/64047?start=60&tstart=0 SiteAdvisor and Firefox]. Following the advice to disable the McAfee SiteAdvisor 3.6.5 add-on worked a treat, so I am up to speed now on my home PC as well. Apparently version 3.6.6 of SiteAdvisor is released next week – I'll see if that help things and report back.
jscher2000
  • Top 10 Contributor
8799 løsninger 71970 svar

Hi BrokenEye, are you also running Windows XP?

Azure is a technology to speed up page layout. It was introduced into Firefox a couple years ago but is constantly tweaked and refined. Apparently something changed in Firefox 27 which reduces performance on some systems. Hopefully that will be discovered and fixed. Meanwhile, you can disable Azure either by toggling the enabled preference from true to false, or changing the backend property to something which isn't available on your system, in which case Firefox won't use be able to use Azure. I don't know what side effects this would have on page layout accuracy or speed; I think you'll have to assess this on the sites important to you to see whether it is the best trade-off for you.

Hi BrokenEye, are you also running Windows XP? Azure is a technology to speed up page layout. It was introduced into Firefox a couple years ago but is constantly tweaked and refined. Apparently something changed in Firefox 27 which reduces performance on some systems. Hopefully that will be discovered and fixed. Meanwhile, you can disable Azure either by toggling the enabled preference from true to false, or changing the backend property to something which isn't available on your system, in which case Firefox won't use be able to use Azure. I don't know what side effects this would have on page layout accuracy or speed; I think you'll have to assess this on the sites important to you to see whether it is the best trade-off for you.
BrokenEye 1 løsninger 70 svar

@BrokenEye@ No, Windows 7.

I'll try that, thanks.

@BrokenEye@ No, Windows 7. I'll try that, thanks.
BrokenEye 1 løsninger 70 svar

Okay, I pulled up about:support but the value of AzureContentBackend is "direct2d", not "cairo". And I don't know how to change the values. There aren't any text fields or anything and the only buttons are "Copy raw data to clipboard", "Copy text to clipboard", "Show Update History", "Show Folder" and "Restart Firefox"

Okay, I pulled up about:support but the value of AzureContentBackend is "direct2d", not "cairo". And I don't know how to change the values. There aren't any text fields or anything and the only buttons are "Copy raw data to clipboard", "Copy text to clipboard", "Show Update History", "Show Folder" and "Restart Firefox"
jscher2000
  • Top 10 Contributor
8799 løsninger 71970 svar

Hi BrokenEye, about:support is an informational page (also accessed using Help > Troubleshooting Information).

If you want to change the settings, you want the about:config preferences editor.

Hi BrokenEye, about:support is an informational page (also accessed using Help > Troubleshooting Information). If you want to change the settings, you want the about:config preferences editor.
BrokenEye 1 løsninger 70 svar

@jscher2000@ Okay, I found gfx.content.azure.backends in about:config. Is that the same as AzureContentBackend? The value is "direct2d,cairo". I want it to just say "direct2d", right?

I just want to be clear on this before making any changes.

@jscher2000@ Okay, I found gfx.content.azure.backends in about:config. Is that the same as AzureContentBackend? The value is "direct2d,cairo". I want it to just say "direct2d", right? I just want to be clear on this before making any changes.
jscher2000
  • Top 10 Contributor
8799 løsninger 71970 svar

Hi BrokenEye, if you want to prevent Firefox from using Azure with the Cairo "back end" then yes, you just want "direct2d". You might need to exit and restart Firefox to see a difference. (Or if there is no difference, this is not your problem.)

Hi BrokenEye, if you want to prevent Firefox from using Azure with the Cairo "back end" then yes, you just want "direct2d". You might need to exit and restart Firefox to see a difference. (Or if there is no difference, this is not your problem.)