Thank you all for participating. I will profile my script soon, meanwhile I hear an opinion from one of our system administrators saying that windows treating processes differently from unix - If CPU is quite idle windows will prefer to "push on it" (= 100% CPU) to finish the script as fast as possible.
Can someone confirm this opinion ?

In reply to Re^2: perl cpu usage on windows machines by leonidlm
in thread perl cpu usage on windows machines by leonidlm

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