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Java Editor extremely slow on larger (10000 lines) files [message #1736188]

Mon, 27 June 2016 12:09

Michael Stiefler

Messages: 4
Registered: June 2016

Junior Member

Hi all,

Since updating to Eclipse Neon I'm suddenly facing an issue with the Java Editor Window becoming quite slow and unresponsive on large files (e.g. Java Source Files with >10.000 lines).
The same files can be edited in Mars.2 flawlessly without any performance impact.

What I did so far was to completely reinstall Neon, choose a fresh workspace and disable anything that seems to be related to editor performance, such as code recommenders, displaying errors while typing, word/line wrapping etc.
The issue persists.

It's really like whatever I add to or remove from the java code, it always takes at least 1-2 seconds for the editor to react.
For instance marking a code block "feels" sluggish already, increasing it's indent by hitting the tab key locks up the editor for 5-10 seconds, pressing crtl+z to undo the indent locks it up for another 5.10 seconds again.
None of this happens with Mars.2 on the same file.

Any ideas what might have made Neon that much slower?

Best regards - Mike

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Re: Java Editor extremely slow on larger (10000 lines) files [message #1736196 is a reply to message #1736188]

Mon, 27 June 2016 12:41

Eric Rizzo

Messages: 3070
Registered: July 2009

Senior Member

If you can reproduce this I'd say it's worthy of a bug report. http://bugs.eclipse.org

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Re: Java Editor extremely slow on larger (10000 lines) files [message #1736304 is a reply to message #1736196]

Tue, 28 June 2016 10:33

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

To collect more information for a bug report, please have a look at http://wiki.eclipse.org/How_to_report_a_deadlock

I know it's not a deadlock, but the same techniques can be applied for "hangs" of several seconds, as well.

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Re: Java Editor extremely slow on larger (10000 lines) files [message #1736314 is a reply to message #1736304]

Tue, 28 June 2016 11:38

Michael Stiefler

Messages: 4
Registered: June 2016

Junior Member

Thanks for the replies, I'll try to get the stack trace and thread dump and check whether it's worth a bug report then.

Best regards - Mike

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Re: Java Editor extremely slow on larger (10000 lines) files [message #1736812 is a reply to message #1736188]

Sat, 02 July 2016 07:09

Michael Stiefler

Messages: 4
Registered: June 2016

Junior Member

Finally found the time to create the bug report, thanks for your replies!
https://bugs.eclipse.org/bugs/show_bug.cgi?id=497175

Best regards - Mike

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