Wireless signal acquisition and saving signal in text format simultaneously for 5 mins

Hi,
I am acquiring ECG signal wirelessly and displaying it in in waveform chart. And simultaneously i need to save it in Text format for 5 mins. The problem i am facing is that for saving the signal i am using Write to Measurement File which saves the file in text format..... but while saving the plotting speed decreases.
i am very new to labview.. so plz can any one tell me whether i am missing any thing in it... plz help.....
 

Why do people always post pictures of their VIs rather than the VIs themselves or at least Snippets?  We can't tell from the picture what Version of LabVIEW you are using (so if we post code, you might not be able to open it), and we can't "play with" your code and try it out without, ourselves, by hand, trying to recreate it from your (sometimes very tiny) diagram.  Please Help Us to Help You!
Here's help anyway to get you started with the Producer/Consumer Design Pattern.
Open LabVIEW.
Click "File", choose "New ..." (not New VI), and choose (from the templates) Producer/Consumer Design Pattern (Data).
Study the Template and adapt it to your problem.
The Producer would be anything that Generates data.  Once you have the data, you put it on the Queue and send it to the Consumer for all the rest of the processing.  The idea is that the Producer has an inherent timing that it has to meet, otherwise you lose data points.  The Consumer, on the other hand, just needs to "more or less" keep up (actually, the Queue can/will expand, so if the amount of data isn't megabytes, the Consumer can really be quite slow, though you usually want the Consumer, on average, to be at least as fast as the Producer).
Bob Schor

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