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I'm assuming you aren't actually using the real-time VM here.
Reading data at 350 bytes per second should not be a problem - but how exactly do you read from this bio-sensor?
The problem is more likely in updating the GUI. As an experiment read your data and output to the console in a minimal format and see how "real-time" it is. If that works okay then the issue is the GUI. If that has problems too then you'll need to look at exactly how you access the data. A NIO related forum might be of more assistance in general.