How to make a basic GUI for interactive plot in Python | PyQt5 | PyQtGraph

This video provides an insight to develop a GUI for the sine and cosine waves in Python. The x axis is from 0 to 2pi. As the user move mouse on the plot, the values are also updated. Thanks for watching, if you have questions, suggestions, please comment, sorry for a little bit typos, Thanks a lot!

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[pyshine_official]

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[bennguyen]

Any thoughts how to maintain a high frame-rate when continuously appending/plotting large arrays of data? I'm receiving 8000 data points from the serial, so for each sample received, I append it to a numpy array, then use pg to plot it real-time. The problem is, the frame rate starts at 60fps but slowly drops as the array grows... less than 3fps after only a few hundred points!

I've read using multiprocessing/pipes may offer better performance than using threads or queues, is that your experience?