is hard on the CPU
people in GPU Linux will get the most coins
And yes is consuming 90% of my cpu and i dont want to screw my pc. I prefer a pool

add to batch file for cpuminer:
-t
and tell it how many threads to use.
for instance if you have a 4 core computer with no hyperthreading and didnt want all it to run 100% you can add the flag
-t 3
and it will only run 3 threads. combine that with set affinity in your task manager if your feeling fancy to keep one core completely open for other tasks (this part is not necessary)