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MonteCarlo simulation is taking much longer time than expected

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Dear All,

I am simulating Monte-carlo of 100 runs on a test-bench with PSS/PAC analysis.

The standalone PSS/PAC run takes just 30 seconds.

But when I run with Monte-carlo, it is taking much longer time than expected. Each run is taking more than 5 minutes. 

More interestingly, as the run number increases, the time increases further. For example, the run#5 took 2 minutes. Now the run#45 is taking 12 minutes.

Why this is happening like this ?  I have disabled  Montecarlo data Save and Plot save.

Could anybody please tell how to get rid of this issue ?

My Virtuoso and Spectre versions are below:-

virtuoso -W
sub-version IC6.1.6-64b.500.14
spectre -W
sub-version 14.1.0.988.isr20

Kind Regards,


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