I've done today a test, since I have at hand an older computer where it doesn't matter if the miner is safe or not.
CPU is i7-920, CPU L2/L3 1/8
The hashrate reported by the pool is 87 H/s = the average for the last 3 hours.
If I remember right, the old miners (way more than one year ago) were showing 75-80 H/s, and they were using the CPU 100%, while this one uses 66%.
So the numbers look pretty good. All this is on default command line and config, do I have to change anything?
It seems that auto detection failed and set treads count to 5 (that's why cpu usage 66% - 5/8), but for your cpu it would be better 4, try to set it manualty "-t 4" for command line or "threads: 5" in config file, it should increase hashrate