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PATRAN gets stuck when playing .ses file

I am trying to play a session file. The file is quite big (contain PCL functions for about 350+ contact definitions) but my system gets first slow and then irresponsive when it reaches 100 above contacts although system details show only 7 % processor and 11% memory usage. Is there any way to solve this issue?
 
According to my understandings PATRAN uses only single core while all other cores are idle. If this is so , how to make use of multiple cores in PATRAN?
 
Thanks in anticipation.
Regards