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As of now when save is invoked the local history has to copy the file(s) so that it can remember the state before the save. This takes time and slows the whole action. The file(s) could be copied at the moment of lock on the file(s) and than asynchronously after each save...
fixed in core-main #f5fc25a58ca9
Integrated into 'main-golden', will be available in build *201203071105* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/f5fc25a58ca9 User: Tomas Stupka <tstupka@netbeans.org> Log: Issue #207273 - Timing of local history copying of files should be changed