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Created attachment 130740 [details] EDT stacktrace During every focus gain/lost we update the list of CND opened editors checking mime types of the opened files. If there is a file with mime type requiring file read (e.g. without an extension) we'll call File.exist several times on every focus change, see attached stacktrace.
fixed in: http://hg.netbeans.org/cnd-main/rev/f00a6d0fee74
Integrated into 'main-golden', will be available in build *201305072300* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/f00a6d0fee74 User: Egor Ushakov <gorrus@netbeans.org> Log: fixed #225427 - Accessing file system in EDT: mime resolving on every focus gain