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An Examination with Valgrind revealed that the most expensive features are mutex locking/unlocking, malloc/cost-free and QImage managing. So I did some optimizations concerning QImage. In dedicate 1f976e5b5ee3cfe40921c74b97edb8d84ff39dd3 I reorganized the Smalltalk bitmap to QImage conversion which resulted in testStandardTests operating time of 14