Hello and thank you for your reply. After reading your post, I tried to rewrite the simulation. From former 144 minutes, I have come down to 23 minutes. The proc model with by took real time 20.00 seconds cpu time 19.92 seconds which means, that it does not work the way I have feared. There are 5000 loops, which has meant 5000*~0,2 seconds = 1000 seconds = 16 2/3 minutes to achieve the same result with 5000 proc model statements.
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