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Open a longer html file like this: http://web.netbeans.org/struts/struts-support-ui-spec.html and try edit it. Every 2 seconds after typing is started code folding process, which takes 100% of processor and more then 30 seconds for one cycle.
Will you Marku mark this as duplicate of #55541 ? The workaround is to avoid using unclosed tags and/or disable code folding feature.
It is 4.1 problem.
There has been done some fixes recently - see issue #55541. Moreover the fold computation code will be rewriten in 4.2. Thanks for your disaster report :-) *** This issue has been marked as a duplicate of 55541 ***
Verified as duplicate then.