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Offline ajavibp

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Low speed in Firefox
« on: 2020/06/21, 11:50:59 »
Hello, lately I have noticed a lack of speed in firefox and I have found something curious. The same speed test gives me half the speed in firefox than in chromium. I have moved the user folder to start a clean session, but with the same result. I downloaded an ISO from Ubuntu with wget and the real speed is the one that marks chromium.Someone else happens?Firefox v 77.0-1 from the debian repository.
Thanks!
« Last Edit: 2020/06/21, 15:17:10 by ajavibp »

Offline dibl

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Re: Low speed in Firefox
« Reply #1 on: 2020/06/21, 16:33:06 »
That's such an odd problem, I repeated your experiment to see how they behave here. I have the same Firefox ver. 77, and I use SRWare Iron ver. 81.0.4200.0. Here are the results:

FF                                               Iron

Down -- 52.07                             Down -- 54.59
Up      -- 11.78                              Up     -- 11.98


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Offline ajavibp

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Re: Low speed in Firefox
« Reply #2 on: 2020/06/21, 16:49:38 »
Thanks for your answer. I will have to continue checking, the bad thing is that I do not know very well what to check.

Offline dibl

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Re: Low speed in Firefox
« Reply #3 on: 2020/06/21, 17:46:16 »
You might want to study the dependencies of Firefox, and see whether there is reason to be suspicious about one of them.  Or, maybe remove/purge Firefox and all of its dependencies, rename the user config files related to Firefox, and try a new installation.

If you have access to a second hardware system on the same router, it would also be interesting to know whether Firefox is a problem on that one also.  Even if it were a windows system, you could boot a Linux live USB stick with Firefox on it, and test it that way.

If you are using a laptop, it might be interesting to go find an open wifi spot and try through a different router.

Just some ideas for you.
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Offline ajavibp

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Re: Low speed in Firefox
« Reply #4 on: 2020/06/21, 17:50:05 »
I'll try. Thanks!

Offline axt

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Re: Low speed in Firefox
« Reply #5 on: 2020/06/21, 19:31:11 »
Quote from: dibl
That's such an odd problem

More likely an add-on problem.

Quote
remove/purge Firefox (...) and try a new installation

And I thought we were here at Linux.

Quote
rename the user config files related to Firefox

Now, that's a useful hint.

ajavibp, close firefox and execute:

Code: [Select]
$ mv ~/.mozilla{,_old}

Offline dibl

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Re: Low speed in Firefox
« Reply #6 on: 2020/06/21, 19:44:07 »
Quote from: axt
More likely an add-on problem.

Yes, good chance.  Find out for sure by reinstalling bare Firefox.   ;D
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Offline axt

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Re: Low speed in Firefox
« Reply #7 on: 2020/06/21, 20:00:35 »
Quote from: dibl
Find out for sure by reinstalling bare Firefox.

Don't take it amiss, but this is nonsense! Re-installing Firefox doesn't help at all.

Add-ons and user configurations are stored in the profile directory. So you rename it (as set forth).

Offline eriefisher

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Re: Low speed in Firefox
« Reply #8 on: 2020/06/21, 20:12:14 »
Rather than starting fresh I would disable any addons. If you get a desirable result then re-enable one at a time to narrow down. If with all the addons disabled you still have a speed issue then I would rename the ~/.Mozilla directory for a fresh start and test the speed. You haven't enabled an unecessary proxy by chance?

Offline ajavibp

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Re: Low speed in Firefox
« Reply #9 on: 2020/06/21, 20:17:32 »
I have removed firefox and moved user folder. I have reinstalled, and nothing, everything the same. I have tried to install firefox-esr (an older version), and nothing changes either.

I am going to test with another PC in which I only have windows, and with a USB-live, to see what happens.The speed difference is brutal, 250 Mbps with firefox and almost 600 Mbps with Chromium.
Thank you very much to everyone for your help.

Offline eriefisher

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Re: Low speed in Firefox
« Reply #10 on: 2020/06/21, 20:43:22 »
Just for curiosity, using speedtest.net.
firefox:  Installed: 77.0-1     ping-15  down-27.77  up-4.86
google-chrome-stable:  Installed: 83.0.4103.106-1     ping-15  down-27.78  up-4.18
Results: Looks near identical to me. One thing though Chrome doesn't render the website correctly. Oh and these are tested using the same servers.
 
« Last Edit: 2020/06/21, 20:47:55 by eriefisher »

Offline ajavibp

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Re: Low speed in Firefox
« Reply #11 on: 2020/06/21, 21:04:41 »
I'm using speedtest.net too (with the same server).On another PC with windows, everything is normal. I have checked the router and I don't see anything strange, QoS is disabled and there are no active priorities or anything like that.wget is fine, I downloaded at 72 MB / s, so it doesn't seem like anything from the system, but rather just from firefox.

Offline ajavibp

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Re: Low speed in Firefox
« Reply #12 on: 2020/06/22, 12:52:56 »
This really was not expecting it.
I have started a Xubuntu 18.04 live via USB. Without touching anything just start:
Firefox 72.0.2 -> Download 251 Mbps, Upload 262 Mbps.
Chromium 83 -> Download 603 Mbps, Upload 626 Mbps
After updating Firefox by repositories:
Firefox 77.0.1 -> Download 274 Mbps, Upload 272 Mbps.

Offline ajavibp

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Re: Low speed in Firefox
« Reply #13 on: 2020/06/22, 12:57:57 »
Thinking it might be a bug on Firefox I just saw this: https://bugzilla.mozilla.org/show_bug.cgi?id=1636904
At least I stay calmer, I was going crazy,
« Last Edit: 2020/06/22, 13:02:12 by ajavibp »

Offline dibl

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Re: Low speed in Firefox
« Reply #14 on: 2020/06/22, 13:00:56 »
Aha!  Good find -- that is good to know.
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