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When calling ClassIndex operations on the dirty class index the Lucene does FS sync which negatively impacts performance. Thanks Jardo for finding it!
Fixed in jat-main d340e46152ed
Integrated into 'main-golden', will be available in build *201002090200* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/d340e46152ed User: Tomas Zezula <tzezula@netbeans.org> Log: #180434:ClassIndex performance impacted by FS sync