Measurement, visualization and saving data in parallel: Performance question

Hello,
I have written an application with 3 loops running in parallel.
The first loop does only measure and analyze measurement values from a DAQmx device (3 analog input signals from 3 sensors with 1000 Hz).
The second loop does only do the visualization with a graph per sensor continously. The data will be sent from the first loop through a queue.
The third loop only saves the data to a file after a measurement has finished. The data will be sent at the end of a measurement from the first loop, too.
There are 3 measurements running asynchronous.
That means it could be that only one sensor will be read, but it also could be that 3 sensors will be read. The duration of each measurement phase and the beginning/end is asynchronous.
Now I have the following problem:
Measurement 1 starts
A short time later measurement 2 starts
Measurement 2 will end, the measurement values will be saved into a binary file
Measurement 1 is still running but the visualization of measurement 1 stops for about 1 second during the saving process. After the data is saved, the visualization runs normally again (no data is lost because of the queue).
Why does tha graph stop its visualization during the saving process (I have a dual core cpu)?
How can I do this in a way, the user does not see any lags?
It all works fine but the "interrups" look very unprofessional.
Regards
Matthias

Hello,
I'm using the producer/consumer pattern.
Maybe it could be, that the dll calls I'm using for saving will interrupt the whole program: http://lavag.org/files/file/212-sqlite-labview/
When I use the LabVIEW File-I/O vis all is fine. But when I use these database vis my application will lag.
Any ideas why this is so? Could it be that the dll calls freeze the application during the saving process (LabVIEW 2011)?
Here are thze dll settings:
Attachments:
dll_settings.PNG ‏50 KB

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package supermarket;
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protected double price;
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protected String expiryDate;
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