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NI DAQMX Driver performance

Hello all,
 
I would like to build a SubVI to generate digital & analog output, but am concerned about possible performance issues.   In some extreme cases I will need to call this SubVI in rapid succession(50ms interval) hundreds of times.   It will contain the following 3 tasks to be executed in sequence:
 
Task #1 - Set two bits high
Task #2 - Analog Generation
              
 
2.  Sychronize two NI-DAQmx PCI cards via a RTSI cable at 40khz sampling rate.
3. Generate
Task #3 - Set two bits low
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duplicate post. continue here
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