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Measuring Frequency from Multiple Inputs with One counter X series Daqmx

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I am attempting to internally mux my Daqmx to read a sample of frequency from 8 input pins.

My current method works but it is slow. 500ms to read 8 channels.

 

However when I have the rest of my Tasks running on my daqmx 6343 the time it takes to read 8 channels jumps up to 2000ms.

Theoritically since i have a 30 ms time out on my read  it should take

 

(30ms time out + 5ms read/write/time/jitter) * 8 = 280 ms aproximatly

 

Why am i getting such bad performance on this task?

 

11-13-2013 1-14-11 PM.png


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