I to pay attention to my "Total credit" is higher and higher, but my "Recent average credit" is lower and lower !? My computer is never power down, and the work unit is never stop, Why? please somebody can give me a answer, Thank you.

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Taiwan Pingtung

My computer is never power down, and the work unit is never stop, Why? please somebody can give me a answer, Thank you.

It comes down to the method that is used here- Credit New- for determining what Credit to allocate for work done.
Unfortunately the amount of credit given varies considerably depending on the Work Units (WU) being processed. Also, some WUs take longer to process, but don't get as much Credit as those that can be done faster.
So the end result is that sometimes RAC will climb, and other times it will fall- all depending on the amount & type of work being processed.

EDIT- it has been a source of annoyance ever since it was brought in, but it's not going to change so while some people have left the project for others that pay higher amounts of Credit, most people just put up with it and continue crunching.

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Grant
Darwin NT

Thank you for your detailed explanation.

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Taiwan Pingtung

And RAC continues to plummet.
WUs that used to pay as much as 100 Cobblestones are now barely giving 70 (sometimes you get lucky with your Wingman and get more. Sometimes).
Yay for Credit New.

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Grant
Darwin NT