Speed ​​was like 1.6 and stayed, but the reward fell ... Can anyone explain why?

google difficulty on mining, that explains it all

Your payout also depends on your proportion of the pool hash rate. If more miners come onto the pool, then your proportion will drop, so the payout drops. If the new miners are finding blocks for the pool equal to their hash rate, as they should, you'll be getting less payout per round, but there will be more rounds (a "round" is the time it takes the pool to find a block), so more, smaller, payouts.

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