just some information about what is possible when running vcvrack on a raspberry pi 4b or a similar arm64 device - i did some experiments inspired by this post: Apple Silicon M1, first system-on-a-chip for Mac computers - which resulted in this post: Apple Silicon M1, first system-on-a-chip for Mac computers …
the result was that i was able to run test-04 on the rpi4 at the default 1.5 ghz cpu freq on two cores with 85% cpu usage on each of the two (see my above post for some more details)
today i did another test with an nvidia jetson nano 2gb overclocked to 1.9ghz (4x arm cortex a57 - usually clocked at a bit below 1.5ghz and in general about as fast as an rpi4) and was able to run test-05 from the above link on that one with 3 threads, each using about 80% of its cpu core … i think the same should be possible with an overclocked rpi4 too - all this just fyi …
best wishes - hexdump