87% cpu usage and 100% gpu usage, good?

Solution
It sounds great to me. 100% GPU utilization is the dream. The problems starts when the CPU is 100% because then it'll inversely affects the GPU utilization.
Personally I never really care about cpu/gpu utilization unless there are performance issue. For games that is not very demanding it is normal to see much lower gpu utilization. But you probably don't want to see all cpu core being peg at 100%.