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lags in acquisition

hi
i am acquiring a waveform using the attached vi. I do it that way (using shift registers and  because i want to save it and do spectral analysis afterwards. i also have a timer that shows me for how long the vi while loop has been running. after like 10s (or repetitions) the acquistion starts to lag. the timer jumps from say 15 to 19 and  the waveform graph is lagging too.
if i analyse the waveform later it seems that all the data is there, still i would like to know, if the lagging can be avoided somehow.
i also tried to use the write waveform to file.vi in the loop with a yes constant  to the append to file and without shift registers but then the spectral analysis does not work anymore.

Thanks P

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