I spectate Mystic at often times when she gets reported and she mines hella fast.
Not sure what you're going on about regarding speed...
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I get over 6k per hour from mining as a level 100 Miner I can say that mining is one of the best ways to make gralats.
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https://i.imgflip.com/2bvibx.jpg
(It's meme reference. I swear I'm not making fun of you)