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=== Why not use plugins from Compiz? ===

This option was considered in the past as well. After examination of Compiz code the conclusion was that this is technically almost impossible. Compiz plugins appear to be merely parts of Compiz that are separated from its core, but which still heavily depend on it - there are even plugins that appear to copy and paste parts of the Compiz core and modify it. Making it possible to use such plugins from KWin would essentially require KWin to become Compiz.