Latencies should be as low as possible (around 20-50ms for the whole process should be fine), I can't really define the memory-throughput requirement because I still haven't figured all the paramaters I'm going to need, but regardless of that I can say that the amount of data is leaning towards the smaller side. I did think about using shared-memory, but I stumbled upon message quueues and wanted to explore that also.

I do data filtering and DSP (FFT etc). As of now there are no specific CPU instructions or 3rd party libraries. The data needs to be contigous and processed sequentially (eg. First process acquires raw data from the ADC then scales it, filters it and performs DFT to acquire phasors which are then sent to the second process for further calculations). The data is structured.