I am trying to convert waveform data in .tdms into ASCII file in a particular format in order to be read by another software. The vi which I have written (attached) is able to do the job but at a very slow pace. In takes the vi approximately 20 minutes to complete a one second data (22050 samples). This us too slow as I am planning to work with waveform data at 1.5 million samples (takes 16 hours). I think the problem is attributed to the string concatination. Does anyone has any suggestion as how I can improve on this vi performance in terms of its speed. Thanks. Running Labview 2011 on a window 7 laptop (i5 2.50GHz with 8G RAM)

Sorry about this question. I had it solved after removing the 'wait until the next ms multiple' vi from the loop iteration.

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String concatenation and vi speed

Solved!

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Thank everyone for their inputs. The original vi which I posted minus the progress bar and with the shift register initialized + some subvi was 380ms average. When replaced with jeff's diagram it took only 142ms! Great.

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String concatenation and vi speed

Re: String concatenation and vi speed