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Bug
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Resolution: Unresolved
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Critical
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None
Hi,
I'm experiencing massive slowdown with Jenkins in its web interface.
I've had a quick look and it seems to be related to ICU's usage for formatting date and time.
Here's a Firefox profile:
https://share.firefox.dev/47mWWnJ
We are currently using Jenkins version 2.427
Cheers,
Alex
[JENKINS-72308] Massive slowdown with Firefox due to usage of locale and time formatting (js) when using Pipeline Stage View Plugin
I installed Firefox 119.0.1 on my Windows computer and did not see any slowdown on the Jenkins 2.426.1 release candidate that I'm using. I did not see any slowdown on Jenkins 2.414.3 using ci.jenkins.io with Firefox 119.0.1.
Can you describe your configuration in more detail so that others can duplicate the issue?
Markus Winter
added a comment - Could it be that you see this slowdown when looking a the full log of a run that has timestamps enabled, where the log is big (>5MiB)?
Markus Winter
added a comment - Could it be that you see this slowdown when looking a the full log of a run that has timestamps enabled, where the log is big (>5MiB)? 
Alexandre
added a comment - Which information exactly do you need?
I run an up to date archlinux.
My locale is `en_US.UTF-8`.
Alexandre
added a comment - Which information exactly do you need?
I run an up to date archlinux.
My locale is `en_US.UTF-8`. Alexandre
added a comment - I get the slowdown when looking at the build overview, not even displaying a single log.
Alexandre
added a comment - I get the slowdown when looking at the build overview, not even displaying a single log. Alexandre
added a comment - I have this issue on Jenkins pipelines using the classic interface, I don't know if other type of tasks triggers it.
If I look at the same job from the blue ocean, then it isn't slow.
Alexandre
added a comment - I have this issue on Jenkins pipelines using the classic interface, I don't know if other type of tasks triggers it.
If I look at the same job from the blue ocean, then it isn't slow. 
Alexandre
added a comment - This is how the screen looks: Alexandre
added a comment - I believe that yes, Jenkins is time stamping the logs.
How to turn that off?
Alexandre
added a comment - I believe that yes, Jenkins is time stamping the logs.
How to turn that off? Alexandre
added a comment - I've tried to install firefox via flatpak and run it (it doesn't share the settings with the one from archlinux), and it was equally slow.
Alexandre
added a comment - I've tried to install firefox via flatpak and run it (it doesn't share the settings with the one from archlinux), and it was equally slow. As you're not accessing the log, the timestamps in the logs are not a problem then.
Markus Winter
added a comment - - edited As you're not accessing the log, the timestamps in the logs are not a problem then. Alexandre
added a comment - I'm uninstalling blue ocean, I could see that it had some i18n modules, maybe that'll solve the problem.
Alexandre
added a comment - I'm uninstalling blue ocean, I could see that it had some i18n modules, maybe that'll solve the problem. Alexandre
added a comment - Uninstalling blue ocean didn't fix it. Markus Winter
added a comment - try uninstalling stage view plugin Alexandre
added a comment - Yeah the stage view was causing all the problems, now it is fast again! Alexandre
added a comment - We'll be using the graph view from now on. Markus Winter
added a comment - Did you start your Jenkins with -Dcom.cloudbees.workflow.rest.external.JobExt.maxRunsPerJob with a high value?
normally this is set to 10 so it should not have a big impact, but when you have a high value here then that could impact performance as all it needs to display so many runs
Markus Winter
added a comment - Did you start your Jenkins with -Dcom.cloudbees.workflow.rest.external.JobExt.maxRunsPerJob with a high value?
normally this is set to 10 so it should not have a big impact, but when you have a high value here then that could impact performance as all it needs to display so many runs Alexandre
added a comment - I have no idea, I'm not responsible for starting Jenkins.
Can I find out from the web interface?
Alexandre
added a comment - I have no idea, I'm not responsible for starting Jenkins.
Can I find out from the web interface? The "Manage Jenkins" / "System information" page includes the list of system properties. If that is defined, it would be listed as a system property.
Maybe the problem is that the js code creates a formatter each time it needs one.
If so, one solution could be to have a single global formatter that you can re-use.