Speech Recognition Simulator.exe problem

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I am running simulator.exe (which comes with Speech SDK 11) using statistical language model. When my input xml file contains few wave files (less than 20) then simulator is running smoothly and it is generating output. But when I input larger list of files,
the program is slowing down dramatically. Even my computer gets stuck. The simulator is throwing following errors on command line -
<span style="font-size:9.5pt; font-family:Verdana,sans-serif; color:#484848 "ASRinput1.xml(2037,2): Error: Error getting transcript semantics of utterance id-1-2c9e85cb32c45d1f0134aaca0ba100a8-32c05172e07d54e97ea300d026a3bfd9<span style="font-size:9.5pt; font-family:Verdana,sans-serif; color:#484848 <br/>
-0-iact.wav: Failed to load grammar "D:SampleSimulatorgrammarscorpus.cfgpp": A task could not complete because the Speech Recognizer engine had t<br/>
imed out (RequestId=c50719c4-adef-494f-9295-62edc948e4f6)."
<span style="font-size:9.5pt; font-family:Verdana,sans-serif; color:#484848 <o:p></o:p>
<span style="font-size:9.5pt; font-family:Verdana,sans-serif; color:#484848 "ASRinput1.xml(2145,2): Error: Error recognizing utterance id-1-2c9e85cb32c45d1f0134aaca0ba100a8-360cbfd357939889cd81221628c3ccbb-0-iact.wav: Failed<span style="font-size:9.5pt; font-family:Verdana,sans-serif; color:#484848 <br/>
to load grammar "D:SampleSimulatorgrammarscorpus.cfgpp": A task could not complete because the Speech Recognizer engine had timed out (RequestId=<br/>
2101e205-6ee4-4ad2-ad17-ed0de8b1531e)."
<span style="font-size:9.5pt; font-family:Verdana,sans-serif; color:#484848 <o:p></o:p>
My intuition is that the simulator.exe is creating too many threads and trying to process all the files parellely. Is this the case and how to get over this problem ?


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