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In performance survey a user was asking for paralelized compilation of projects: "I need to parallize the compiling. I have many independent libraries that are not interdependent and could be compiled in parralle. All libraries are of the netbeans lib project type. Can you change the ant scripts so that they can be parralized ? on my linux 3 GHZ pentium the compiling never excededs 50% of the CPU."
There are way too many possible problems that can be introduced by parallelization to make it default behavior. Users who know they want this (who know their SMP machine can do better) and who know there are not going to be any tricky effects, can use Ant's normal <parallel> task (override the 'deps-jar' target to use it).