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Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

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New Contributor

Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

Firefox is really starting to annoy me. Sometimes it runs slow and sluggishly, other times it doesn't. Usually it does though. When I open new tabs, the connection icon will just keep swirling. I constantly get High CPU Useage alerts from my virus protection. I've done everything listed in the below articles. Does anyone have some advice? Firefox didn't use to be like this.

Thank you.

https://support.mozilla.org/en-US/questions/864739?as=aaq

https://support.mozilla.org/en-US/questions/882138#answer-256718

15 REPLIES
All Star Contributor

Re: Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

New Contributor

Re: Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

Hi, thanks for replying.

I don't understand computers very well, can you explain what I do with this information please?

Thank you again.

All Star Contributor

Re: Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

Some people had problems with there being too many open connections to web servers. In the window for about:config is a setting for network.http.max-connections. The suggestion was to reduce that from 256 to 48. Maybe this has already been done for Windows, though? I am using Mac OS, and the number there by default for me is still 256.

Another reason why Firefox might be slow is multiple extensions which make heavy demands on the browser. It might help to check this list:

Site Moderator

Re: Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do not click the Reset button on the Safe mode start window or otherwise make changes.

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that works.

New Contributor

Re: Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

I appreciate you guys trying to help, but I am severely limited when it comes to computer knowledge. I know this is probably very annoying, but can you be more specific?

I've done the things outlined in the two links I listed at the beginning, changing the thing to 48 and all.

Thank you guys a lot for taking the time to help me.

New Contributor

Re: Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

Alright, it's getting to the point where I can barely use FireFox anymore. It's getting worse by the day, I don't understand. Web pages take a LONG time to load, but sometimes they don't....it's hit or miss. But when they do take a long time, they take a long time.

It's getting very bad. I don't know much about computers, safe mode, and all that. It would really help if someone could walk me through what to do, like they would a 10-year old... actually a 10-year old probably knows more than me. Well you get the idea.

I really want to keep using this browser, but if I don't get it fixed I will have to stop. Like I said in the initial post, I've done all the things those two links suggested. It got better at first, but now it seems like it's gotten worse.

New Contributor

Re: Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

I mean, now my mouse cursor is flickering. Only when on the internet, if I close the internet window and go to my desktop, it doesn't flicker anymore.

Will someone please help me? Much appreciated Smiley Happy

All Star Contributor

Re: Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

Does this flickering happen if you start Firefox in its safe mode? If not, it could be an extension that is causing the problem.

Does the flickering happen if you disable the Adobe Flash plugin? Flash has been known to cause that. You could try different versions of Flash plugin and see if a different version cures the problem. There are a few here:

Have you tried disabling hardware acceleration? That has been known to cause slowdowns and other problems in some systems. In Options > Advanced > General, uncheck "Use hardware acceleration when available".

New Contributor

Re: Firefox is running slow, sluggishly, websites take a long time to load, to connect. I've done everything this board has suggested.

Ok, I disabled "Use hardware acceleration when available."

We'll see if that helps.

Today was the worst. I couldn't even open the browser - it just kept "Connecting" ... I had to restart my computer, try several times, and then it finally opened my home page.

When I go to put it in Safe Mode, Firefox recommends the Reset Firefox feature. It says it will restore Firefox to its default factory state, and that this may be better than using Safe Mode and trying to troubleshoot on my own.

Should I use the Reset Firefox feature?