Hi Daniel,
Judging from my pi3 mid relay where 5mbit traffic is
about 20% of 1 core (tor uses 1 core mostly) 20-25mbit should be fine for pi3.
In the peak hours it will be probably close to maximum what pi3 is capable on 1
core
but when cost is a factor I would not think of anything else
1gb ram is more than enough, my tor uses about 150mb
If you think of exit, cpu load may be higher
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