OONI is the Open Observatory for Network Interference. Its aim is to collect high quality data using open methodologies and FL/OSS to share observations and data about the kind, methods and amount of surveillance and censorship in the world. In other words to answer questions:
Firstly, a RPI is a reasonably low powered machine, but still enough to run as a desktop machine.
To investigate how the rpi deals with ooni-probe I ran 10 concurrent HTTP_request tests to see its performance. I started each test with 60 seconds delay between each.
This is a list of the tests carried out and the output during the tests.
Sometimes when you run ooni-probe the tests will fail. This is due to the Tor client not able to get its own IP address if all the descriptors have been cached. A work around is explained on #ooni by aagbsn.