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Also is it possible on rentals, that due to the extra time involved to go from the miner to the rental network, then to the pool adds
unattractive latency or delays to the share transmittal? IMO this could add an issue with finding blocks, vs direct mining to the pool.
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Yes using a random proxy adds latency.
Worse the fact that the miners on that proxy are who knows where on the planet.
It works like this:
Miner (who knows where) -> Proxy -> Pool -> Proxy -> Miner (who knows where)
So indeed it adds latency.