Your hash rate calculation seems quite a bit off to me

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It shows 6 MHashes/sec while my miner shows 220 Mhashes/sec, and I get my shares accepted at the rate I usually have on other pools, so it's probably not bad luck

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If you've just started, it might take a while to stabilize. On the other hand, I've noticed my rate is a little low too. I'll be looking into it
