I think you mean "if" it goes live. That ticket has been open for 4 years, and originally had a milestone for 0.2.4.
Im running 5 Mbits mid node on Pi3. Cpu load is 25-30% on 1 core with full steady traffic - no aes-ni here.
Things should improve greatly when this ticket will go live in 0.2.9.x
https://trac.torproject.org/projects/tor/ticket/7572
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