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From "Shevek (JIRA)" <>
Subject [jira] [Commented] (NETBEANS-2291) NetBeans is unusably slow
Date Tue, 21 May 2019 03:00:01 GMT


Shevek commented on NETBEANS-2291:

Disabling Atk has made a MASSIVE GUI difference. Will see if it persists across a rebase.

> NetBeans is unusably slow
> -------------------------
>                 Key: NETBEANS-2291
>                 URL:
>             Project: NetBeans
>          Issue Type: Bug
>          Components: projects - Gradle
>    Affects Versions: 8.2, 10.0, 11.0
>         Environment: Ubuntu 18.10
> Linux 4.18.0
> 12 core Xeon E-2176M with 64Gb RAM
> -Xmx2536m (2.5Gb for NB, of which it uses about 1.7G)
> NetBeans 10vc2, 10vc5, 8.2
> JDK 11.0.1
> JDK 1.8
> G1GC, CMS GC, Serial GC
>            Reporter: Shevek
>            Assignee: Laszlo Kishalmi
>            Priority: Critical
>              Labels: performance, usability
>         Attachments: nb-11-slow-hotspots.png, netbeans-10vc5-jdk8-hang-gototype.txt.tdump,
netbeans-10vc5-jdk8-hang-progressutils.txt.tdump, netbeans-10vc5-jdk8-hang.txt.tdump, open-file-slow-01.txt.tdump,
open-file-slow-02.txt.tdump, open-file-slow-03.txt.tdump, slow-stack-00.txt
> I used to use NetBeans 8 on JDK8, it was tolerable, but slow.
> Now I have a new laptop, I've tried nb8, nb10 on jdk8, jdk11, with g1gc, cmsgc, other
gc. They are all UNUSABLY slow. By which I mean, it takes over a minute just to open a file.
> Mostly this is because things are waiting for things waiting for very inefficiently implemnted
file I/O, editor parsing, or things like that. I've watched a 12-core Xeon chip spend over
4 hours just attempting to handle the Active Reference Queue Daemon thread.
> The slowdown is somewhat incremental - I can escape it as long as I'm happy to restart
NetBeans every hour or so (which I'm not happy to do).
> Attached a stack dump to get you started, this took over a minute to open a 284-line
Java file from idle.
> Please feel free to ask all the obvious questions, although I'm fairly sure all the obvious
things have been done. Mostly, I've got GC down to a negligible amount.
> If there's one or more features of NetBeans I can disable to get acceptable behaviour
while still being able to realistically edit Java code, please tell me and I will disable
them because I am at the end of my rope after using (and developing for) NetBeans for nearly
10 years. If I can get IntelliJ to load a Java/Gradle project neatly before this gets fixed,
I'm gone.

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