You haven't got all of the optimizations done, or have something fubarred. I'm running an i7-6700 with 11 cameras, and it runs just under 10%. Add in DeepStack on 4-5 cameras, two OpenALPR, and it is up to close to 20%. That was before I upgraded the ram to 16 GB, it was about the same on 8 GB. Check the optimizations. Check Windows startup. Make sure Windows isn't trying to run virus checking on the BVR files.