I can only do some limited testing over the next day or two, but here is my 48 core AMD setup running Windows Server 2008 R2 and only has 16GB Ram.

http://yafu.myfirewall.org/yafu/show_host_detail.php?hostid=9889

CPU time was: 101,392.30
Credit was: 1,626.15
So, that means it was getting 1 point every 62.35 seconds on the first completed work unit.

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Results during the last couple of days have shown point scoring bouncing around between 1 point every 5 seconds to 1 point every 21 seconds for my 48 core AMD system.

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Running time of 'ecm' process (multiple instance) not calculated as run/cpu time. Only 'yafu' time. No cpu time – no credit :-(

IMHO no problem with Credit New or Credit Old system.
Problem with 2nd level process: wrapper - yafu - ecm/gnfs.

May be another way needed to run sub process tree.

WU 988073
CPU time 2 days 3 hours
Credit granted 37.17
That's 1 credit every 4960 seconds...
Do you still think CreditNew is working properly?