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Firefox and the JSS, high CPU usage

  • November 1, 2016
  • 4 replies
  • 16 views
bpavlov
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  • bpavlov
  • Esteemed Contributor
  • 1206 replies

I've had an issue that's been rather frustrating in Firefox at least with the current major version 49. I wanted to see if others had seen it. I guess they introduced this new process separation for each tab in Firefox similar to what Chrome and Safari have done for a while and I've noticed that if I’ve got a lot of JSS tabs open, especially tabs where the session has timed out, it really brings the browser to a crawl. Activity monitor has the Firefox Web Content process beyond 100% CPU usage. Everything starts to calm down as soon as I close out the JSS tabs. Is anyone else seeing this in Firefox (or any other browser for that matter)? We are on JSS 9.93 if it makes a different, but the problem persists even with 9.96 which we've got setup in a test environment.

    4 replies

    bburdeaux
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    • bburdeaux
    • Contributor
    • 107 replies
    • November 1, 2016

    I've been seeing this behavior as well. I do most of my work in Firefox on my PC, where Firefox will slow down and eventually crash entirely, but I've noticed similar behavior when I do work on my mac. We are currently running on 9.96, but have been having these issues for a few versions.

    S
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    • snovak
    • Contributor
    • 50 replies
    • November 2, 2016

    I think it may have to do with the javascript they are using to track session expiration, but I've noticed recently that my FF uses a lot of CPU for no reason and I've seen memory bloat upwards of 5GB...

    [about:performance](about:performance) may be helpful.

    bburdeaux
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    • bburdeaux
    • Contributor
    • 107 replies
    • November 2, 2016


    I left several tabs open, including one JSS tab and about:preformance, when I went to lunch. When I got back to my desk, the only tab that showed any performance hit was the JSS tab.

    G
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    • GULibSystems
    • New Contributor
    • 3 replies
    • March 20, 2017

    +1. I'm on JSS 9.96 and Firefox ESR 52 (though it's been happening for a while, so older versions of Firefox ESR can also be included) on Windows 7. If my Firefox is running slowly, I simply need to hunt down the tab which has a JSS tab open and once I close that, Firefox is back to its usual responsive self.

    It's gotten worse than usual though, and I just tested and it took 14 seconds to load my policies.html page. Chrome does it in about 2.5 seconds. AdBlock Plus is running on Firefox.


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