I guess you know this already, just to put it down: the next.txt file doesn't work because the firstpass queue is empty. It ran empty because of an amok client requesting all the work for himself. The tests are now in the dropped test queue, hence the problem. It will fix automattically as soon as Firstpass reaches 12M (in a couple of months).
(On the other hand, if one could fix it, it would be better. But the Paladins of the forum would have done it already, right? Dunno.)
As for CPU and memory usage, there is this menu about daytime and nighttime settings; you can ajust it as you want. Do you need more accurate adjustment? Then you can put multiple exact times in the prime.ini, I think. I read it somewhere, probably in the readme.txt. I'm not sure anymore and too lazy to download it and check.
Wonder if I was of any help, yours H.