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https://issues.apache.org/jira/browse/NETBEANS-5304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17275878#comment-17275878
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Matthias Bläsing commented on NETBEANS-5304:
--------------------------------------------
I can reproduce this with OpenJDK 8 + 11 on Ubuntu Linux:
{{Java: 1.8.0_262; OpenJDK 64-Bit Server VM 25.262-b10}}
{{Runtime: OpenJDK Runtime Environment 1.8.0_262-b10}}
{{openjdk version "11.0.9.1" 2020-11-04}}
{{OpenJDK Runtime Environment (build 11.0.9.1+1-Ubuntu-0ubuntu1.20.10)}}
{{OpenJDK 64-Bit Server VM (build 11.0.9.1+1-Ubuntu-0ubuntu1.20.10, mixed mode,
sharing)}}
I attached an profiler snapshot from the problem and it seems, that hiding the
popup uses massive resources. I don't understand why the rendering of the whole
file seems fine, but hiding the rendering has such huge impact. In the
profiler, only one method stands out:
{{javax.swing.PopupFactory$MediumWeightPopup.hide ()}}
>From my POV we see an issue in the JDK here, but that won't help (or only help
>in the very long run). I'll try to see why the problem happens and what we can
>do to work around that.
> NB Freezes when Editing CSS Files
> ---------------------------------
>
> Key: NETBEANS-5304
> URL: https://issues.apache.org/jira/browse/NETBEANS-5304
> Project: NetBeans
> Issue Type: Bug
> Components: web - CSS Editor
> Affects Versions: 12.2
> Environment: NB 12.2, Windows 10, 16 GB RAM. CPU utilization of
> Netbeans 25% on a 4-core system, I assume NB causes 100% utilization on the
> core it runs on.
> Reporter: Krzysztof Trybowski
> Priority: Major
> Attachments: CSS.nps, nb_frozen.png
>
>
> While editing CSS files, NetBeans tends to freeze. This always happens when
> popup help appears. For example I start typing "background". But then a popup
> appears, showing help for "backface-visibility" which is completely
> irrelevant, and NB hangs for about 20 minutes.
> You never know when it would happen. It happens in a minority of cases, but
> it still means it happens at least once a day.
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