Since our initial offer we've upgraded Zhashrate 5 times by now, and we continue to look for further improvements. It is impossible to say how much future enhancements will be or how fast we can implement those, but our teams continue to work hard at improving efficiency and we expect we will be able to extend further.
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Your Genesis Mining Team
Thank you for your response. Claymore wrote that he plans to release another version of miner with a significant increase in speed.