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Highlight an indented section of XML in a large file in the Code Editor and press CTRL-D. Even with one or two screens of text, NetBeans hangs for several seconds while doing this processing. Don't know whether this is an editor bug or an XML text editor bug, but I'm wondering if there is some kind of reparsing happening with each line that is modified. Have not seen this performance problem when editing Java.
You are right, module listens on Document changes and propagate them into tree model immediatelly. It is covered by "large files" umbrella bug. *** This issue has been marked as a duplicate of 22789 ***
VERIFIED
Resolved for 3.4.x or earlier, no new info since then -> closing.