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Thread: web client: high cpu usage on firefox 18.0

  1. #1
    rosch is offline Special Member
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    Default web client: high cpu usage on firefox 18.0

    Hi all,

    unfortunately the latest* Firefox 18 is using way too much cpu, about 20% compared to <5% for Firefox 17.
    This is Firefox idling. Logging into Zimbra and waiting for it to settle takes some time with CPU usage up to 100%.

    Can somebody else confirm this?

    Hence recommend not to update to Firefox 18 if using the Zimbra Web Client.
    Note: the percentages are for the Firefox process only (in my case that is /usr/lib/firefox/firefox).

    Release 7.2.0_GA_2669.UBUNTU10_64 UBUNTU10_64 FOSS edition, Patch 7.2.0_P1.
    *latest on Ubuntu 10.4.
    Last edited by rosch; 01-11-2013 at 09:37 AM. Reason: added more information
    --
    cheers

  2. #2
    phoenix is online now Zimbra Consultant & Moderator
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    I don't see that behaviour connected to a ZCS 8.0.2 server (using FF on openSUSE 12.2 64bit) and unfortunately I don't have a ZCS 7.2.0 to test at the moment. You don't mention whether this is Windows (if so, which version) or Linux.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    rosch is offline Special Member
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    Quote Originally Posted by phoenix View Post
    You don't mention whether this is Windows (if so, which version) or Linux.
    I do (*latest on Ubuntu 10.4) but maybe it was not clear enough.

    To sum up I see this issue on Ubuntu 10.04.4 LTS desktops:
    CPU 20% for Firefox. Was < 5% on Firefox 17.
    Running Firefox with -safe-mode: 15-17% CPU. Still way too much.

    Also tested on Windows XP 32bit (Firefox 18):
    CPU 8-12% for Firefox. Are those normal values?
    (that is idling with one tab open, the Zimbra Web client).
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  4. #4
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by rosch View Post
    I do (*latest on Ubuntu 10.4) but maybe it was not clear enough.
    I assumed that was the ZCS server version.

    Quote Originally Posted by rosch View Post
    To sum up I see this issue on Ubuntu 10.04.4 LTS desktops:
    CPU 20% for Firefox. Was < 5% on Firefox 17.
    Running Firefox with -safe-mode: 15-17% CPU. Still way too much.

    Also tested on Windows XP 32bit (Firefox 18):
    CPU 8-12% for Firefox. Are those normal values?
    (that is idling with one tab open, the Zimbra Web client).
    I don't see anything like that, my FF is usually three instances with 100+ tabs open (inc. the ZCS web UI) and I see about 3% CPU on Windows (various flavours) and on my openSUSE system. As I said, I don't currently have any ZCS 7.2.2 to test against but I wouldn't expect any great difference. Are you on the same LAN as the ZCS server when you have this problem or external? If you gave me a test account I could try connecting and see if it makes any difference to my CPS usage, send me a PM if you want me to do that.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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    rosch is offline Special Member
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    Quote Originally Posted by phoenix View Post
    Are you on the same LAN as the ZCS server when you have this problem or external?
    Yes, same LAN. (also external, with the same results)
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  6. #6
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by rosch View Post
    Yes, same LAN. (also external, with the same results)
    OK, I did have a look and I can confirm the high CPU usage - it went up-to +20% and then dropped back to 10% and stayed there while the web UI was open. I did notice that you have quite a few zimlets enabled on the account, if I uncheck them then the cpu usage goes down to about 6% with an occasional spike of 10%. From that quick test I'd say that one of those zimlets is causing a problem, you could try adding those back in one-by-one and see if one of them causes problems.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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    rosch is offline Special Member
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    Quote Originally Posted by phoenix View Post
    From that quick test I'd say that one of those zimlets is causing a problem, you could try adding those back in one-by-one and see if one of them causes problems.
    When disabling all zimlets Firefox is still using about 10%. I still think that is 10 times too much.
    Also why are the zimlets consuming cpu when idling?

    Enabling 3 (basic) zimlets uses about 9-10% which confirms that idling zimlets should not consume cpu.

    Thanks a lot for testing
    Last edited by rosch; 01-11-2013 at 01:16 PM. Reason: added detail about enabling 3 zimlets
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  8. #8
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by rosch View Post
    When disabling all zimlets Firefox is still using about 10%. I still think that is 10 times too much.
    Also why are the zimlets consuming cpu when idling?

    Enabling 3 (basic) zimlets uses about 9-10% which confirms that idling zimlets should not consume cpu.
    I would agree that the CPU usage is higher than it should be unfortunately I'm not a coder so I can't really give you any help with debugging those zimlets. I guess you'll have to wait for a forum member with a lot more skills than I possess and possibly visit bugzilla to file a report, sorry I can't be of more help.

    Quote Originally Posted by rosch View Post
    Thanks a lot for testing
    You're welcome.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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    rosch is offline Special Member
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    Quote Originally Posted by phoenix View Post
    I would agree that the CPU usage is higher than it should be unfortunately I'm not a coder so I can't really give you any help with debugging those zimlets. I guess you'll have to wait for a forum member with a lot more skills than I possess and possibly visit bugzilla to file a report, sorry I can't be of more help.
    You helped a lot already.
    The only suspicious item from the Firefox 18 releasenotes is this one, which is a new feature:
    Faster JavaScript performance via IonMonkey compiler

    I might look into that later some time.

    Update: beta and alpha tests:
    Firefox 19.0 beta 1: CPU 8-10%
    Firefox 20.0 alpha 2: CPU 7-8%

    So it seems it is less of an issue in the coming versions but still relatively high.
    Last edited by rosch; 01-15-2013 at 01:17 PM. Reason: new findings
    --
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