I have seen when i mine Monero in pc, the cpu utilized goes to 95% to 100% most of the time, i want to keep it to 75 to 80%, what can i do? will it work by specifying the threads? I have a 4 core pc.
Typically if you have an AES-NI capable processor you will find the "sweet spot" at 1/2 the number of cores you have, so you won't ever be mining to 100% anyway. Right now we don't have a mechanism to throttle it beyond that, but we are working hard at that exact thing as part of the Smart Mining effort.