BF1 uses a hyperthreaded quad-core processor's cores quite effectively, delivering high framerates; be content with the high framerates, and, less time worrying over a 90% cpu utilisation. Quad core/non hyperthreaded cpus are beginning to be a bit taxed at some of the newer games, but, as long as your min/average framerates are acceptable, there is little you can do to influence this number 'lower'...