The new 4.8 series contains two interesting features the exit stream conflux for better performance by creating different streams to the same exit. We can enable it early though the value of it is not much et because not many exits support it and it’s planned to be used as a default once it’s rolled out to more nodes.
More important is the Onion PoW for DoS mitigation. Question is if we can ship this by default or must otherwise document it.
set HiddenServicePoWDefensesEnabled 1 in your torrc