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In OpenSolaris 2009.06 the version of ant bundled within the IDE (1.8.0, February 2010) performs very bad. Clean and build of a module suite with 4 modules takes 1min 9 secs. A change to ant 1.8.1 (March, 2010) improves performance dramatically: Clean and build of the same module suite takes 19 seconds. I assume 1.8.0 has some bad performance issues in this platform. Can't tell if this happens in other platforms too.
Closing the issue as latest nightly builds bundle ant 1.8.1.
*** This bug has been marked as a duplicate of bug 185375 ***