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FireFox becomes slow; restarting Firefox fixes problem. Why?

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  • 3 zinale nkinga
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  • Igcine ukuphendulwa ngu johnnooh7

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I am just wondering why FireFox occasionally becomes slow to load web pages. On these occasions, restarting Firefox fixes the problem immediately.

Example, I was just loading the same page repeatedly because of some work I am doing. After about 15 minutes of slow response times, I restarted FireFox and immediately, the page loaded very quickly as usual.

You can see the page where this was occurring at this url: https://legacy-systems.biz/demo/demo.html

Any information etc. would be appreciated immensely.

Okulungisiwe ngu Carla Rogers

Isisombululo esikhethiwe

Maybe check for memory issues.

You can check the Firefox Task Manager (about:performance) and about:memory pages.

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window
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All Replies (4)

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Isisombululo Esikhethiwe

Maybe check for memory issues.

You can check the Firefox Task Manager (about:performance) and about:memory pages.

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window

Helpful?

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jscher2000 said on another thread

I see your previous question here: https://support.mozilla.org/questions/1296747 I think that is just a really difficult question to answer.

Thank you very much for offering a comment on that question. This comment surprises me a lot. I figured this behavior must be well known and there must be some kind of well-known cause and an explanation of why it has not been resolved. I have noticed this behavior (browser slowing down after hours of heavy use) for at least five years.

For what it is worth, way back in the day, browsers, possibly including FireFox, had a habit of increasing memory usage when used for long periods, causing slowdowns. That problem was attributed to memory leaks, but I cannot verify that was the actual cause. I can verify the problem would be cleared by restarting the browser. My perception is memory leaks cannot be the cause now, because QA of major software such as FireFox would prevent that from happening. I am guessing the problem is associated with cache. Perhaps I have a bad combination of browser configuration settings causing this.

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I have been having the same issue I think. Can't play your demo link. After awhile Firefox becomes extremely laggy and I have to restart it. I've removed all my extensions except for ublock and lastpass and that didn't help. I'm going to try and disable my theme and see what happens. I'll look at the task manager (as indicated by cor-el) next time.

Well, no luck it still gets laggy. Task manager doesn't show anything abnormal that I can see.

Okulungisiwe ngu ritusgrin

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whenever I load a website firefox becomes too much slow I'm annoyed with it. I'm thinking to change my browser right now, even my internet connection is stable.

Okulungisiwe ngu johnnooh7

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