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FileUtil.toFile (FileObject) is a utility method performing conversion from FO to File and is used heavily in the IDE even during typing in editor - geting platform classpath for Java parsing, UpdateTrackingFileOwnerQuery, checking for write access, CVS annotations These conversions boils down to File.isDirectory and thus access I/O devices. This is a big problem for slow devices or notebook running in power saving mode.
Reassigning to new module owner jskrivanek.
It has already been fixed.