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Windows 7: Firefox very slow [not the usual cause?]

01 Oct 2012   #1

Windows 7 Home Premium, 64b
Firefox very slow [not the usual cause?]

Hi all

I've been on a brand new build and after a few weeks it turned out my Seasonic X660 PSU seemed to be going bad on a handful occasions (cursor freezes, sudden restarts, ...; got the GigaByte boot loops as well).

I'm sure one or all these instances had Firefox 15 opened, but I don't feel it was the cause. But IMO, one of the freezes or restarts damaged something that FF needs.

I'm back up now with my older PSU. Firefox still starts up instantly but is loading pages slower than an old phone modem, if at all [currently fresh install, no extensions]
I first followed all the regular tips, then reinstalled, the 2nd time trying to delete everything I could find from Mozilla first, but it keeps on doing it... IE 9 is fine.

I did an "sfc /scannow" and "check disk" with no problems found. Also explicitly letting it through Windows firewall. So I'm figuring Mozilla is using some part of Windows that IE doesn't need and may be damaged?

I feel lost without Firefox and ran it very fast and perfectly with 25 extensions...

Any clue? Would I have a better chance with an older version that maybe didn't use certain technology yet? (haven't asked in the Mozilla forums yet, cause I'm considering you guys smarter )

If this could be found, it might be the cause for other users too.


My System SpecsSystem Spec

02 Oct 2012   #2

W7 Pro SP1 64bit

Welcome to the Seven Forums.

You might want to try Process Monitor to see just what Firefox is doing (or not doing).

See this post for some info on filtering:
Missing start menu icons

edit: you would not want to limit the returns to those impacting only the registry... you want to see all activity by Firefox.
My System SpecsSystem Spec
02 Oct 2012   #3

Windows 7 Home Premium, 64b

Thank you x2

Here's a log from Procmon: log

I monitored while starting it up and auto-loading this page (some of it was already cached).
Then at 8:15 I'm loading another page slowly.


Edit: just saw your edit... I only have the register activity, it seems. Will look into it again.
My System SpecsSystem Spec

02 Oct 2012   #4

Windows 7 Home Premium, 64b

Here's one starting up FF and auto-loading Procmon log [link now working]

Included all but profiling events.
My System SpecsSystem Spec
02 Oct 2012   #5

W7 Pro SP1 64bit

sorry - someone else will need to look at it... I only have Windows 7 32bit.

Firefox very slow [not the usual cause?]-64.jpg

edit: btw - all of the data is captured, the buttons in the upper right just filter what you see of that total that was collected.

My System SpecsSystem Spec
02 Oct 2012   #6

Windows 7 Home Premium, 64b


What intuitively strikes me most is a bunch of "FAST IO DISALLOWED" results...

I'm gonna try and find a much older FF version now.

Edit: v5 works well and I let it self-update and it became v12 working well.
My System SpecsSystem Spec
02 Oct 2012   #7

Windows 7 Home Premium, 64b

I installed 15 again in a seperate "full_access" folder outside the Program Files ones and it's working.

I had been guessing for a while it may have had to do with the whole "Administrator" stuff I have never researched or wanted to use. So at Windows install, I may have opted for what I thought would remove this (like I could in XP) and maybe deleted some field, not filled out a password, or something like that.

I just wish to be always in Administrator mode or whatever, just as long as I have no hassles like these... I hope there's a fix for that if I look it up? Or is that not possible?

Still doesn't explain why it worked before though.

BTW: I've just had two major cursor freezes in the previous FF installs. It always starts with one or two and then it's definite, can't even view the task manager anymore. "I hope" this is from FF itself (I think so) and my system is stable.
My System SpecsSystem Spec
02 Oct 2012   #8

Windows 7 Home Premium, 64b

Getting cursor freeze in 15 as well. Didn't use to have them *that* much before...

Nightmare scenario...

Last hope is FF 16 betas, I guess...

If not:
- any other browser that loads FF extensions?
- what browser is most extensible besides FF? Chrome?
My System SpecsSystem Spec
02 Oct 2012   #9

W7 Pro SP1 64bit

I'm not sure what you are asking - re: administrator mode.

Do you see those "FAST IO DISALLOWED" within Process Monitor when running the Firefox install that works well for you?

You might want to run Process Monitor and stop the data capture as soon as you get cursor control back after a Firefox freeze.
My System SpecsSystem Spec
02 Oct 2012   #10

Microsoft Windows 7 Home Premium 64-bit 7600

sometimes it helps to create a new profile for firefox, the old profile can be copied across ,which includes settings and extensions etc.

Creating a new Firefox profile on Windows - MozillaZine Knowledge Base
My System SpecsSystem Spec

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