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Post: The performance gains from switching to an RPi 4 or C/C++ depends mainly on your application. With the ADC Pi the sample rate is limited by the ADC chip so switching to a faster Raspberry Pi or using C/C++ will give you only a small performance gain in the time it takes to process the ADC sample after it has been read from the ADC Pi. With the IO Pi, you will get a slightly better response time reading and writing to the IO pins using C/C++. Changing the I2C bus speed from the default 100KHz to 400KHz will give a bigger performance gain as you will be reducing the time it takes to transfer the data on the I2C bus. You can test the speed difference on the ADC Pi by using the speed test demos that are in the ADCPi demo folders for C, C++ and Python libraries in our [url=https://github.com/abelectronicsuk]GitHub repositories[/url]. The main performance gains when switching to an RPi 4 or C/C++ will be in other parts of the application, for example drawing a GUI to the display. C and C++ will be faster than Python as they are compiled languages so they will have lower overheads in terms of CPU cycles and memory. You just have to be more careful with your memory management as C and C++ make it far easier to create memory leaks and buffer overruns.