I changed conf to this
addnode=explorer.biblepay.org
gen=1
genproclimit=20
minersleep=0
tithe=10
nickname=pagalo
tithing=10
CPU load still about 10%. It varies from 5.5% to 13%
While Im testing this please try:
minersleep=-1
And genproclimit=30
Lets see if it goes above 50%. Im trying genproclimit=40 and seeing 93% cpu use in win7.
One other thing you can try is running the 32bit version (as a test) on your machine and see if it rises.
Let me test some minersleep settings on my box.
With minersleep=-1, the tithe parameters removed, and genproclimit=10 Im seeing 100% cpu use on windows7.
Please try that.