I run several processes and now they only get some 30% cpu in total, pre-Mavericks they got 100% each – what has happened?

From Terminal I use gmake to run rather calculation intensive processes, usually in severel threads for several days. I need to process some 120000 files containing around 10 Tbyte data in total. The tools I use are implemented in C++ and have no GUI. Pre-Maverick this worked as expected: running four threads I got 4X100% cpu. After upgrading to Maverick I typically only get 30% in total. No other process is "stealing" cpu time, the computer is just sitting idle...
Basically, my calculations now run at 1/16 the original pre-Maverick speed due to the lack of cpu time.
In Activity Monitor I can tell that App Nap is off for these processes.
I disapled timer coalescing, but it didn't help.
Why are my processes somehow given such low priority?
How can I solve this issue?

Thanks for the reply. They might execute slightly faster after recompilation, but I don't really see why it would get me more cpu time? They execute as fast now as they did pre-Mavericks in terms of user+system time, but it does not help as they only get 1/16 as much cpu resources...
Anyhow, one should try everything. I did recompile and it didn't help.

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