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You're describing the CPU load of an 8 core system with a single percentage, this is a major simplification. If you view the system monitor you should see a percentage for each core, which will tell you a lot more about what's going on.
I suspect at least one maybe more single threaded processes are maxing out some of your cores, so you'll see some of them at 100% while others are lower. Maxing out a single core will only show as 12% overall CPU usage but will mean that process is no longer keeping up.
Can you re-run the test with the system monitor showing the utilization of each core and let us know what you see.
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