I don’t know the cause, but it has been resolved at this time.
AMD chipset driver: 1.09.27.1033
RadeonSoftware: 19.11.1
Power management plan: AMD Ryzen High Performance
In these configurations and settings, the CPU and GPU are almost 100%.
It keeps about 100fps for solo rides, about 30fps for races and group rides.
Poor english, sorry.!