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Chromium always uses the CPU to render the web pages when EnableGPU is False but if you set EnableGPU to True it will use your graphics card to lower the CPU usage.
Set GlobalCEFApp.EnableGPU to True and you will see that the games run faster and the CPU has a lower usage.
There are a few more properties that could limit the CPU usage indirectly but I would recommend following these steps :
https://www.makeuseof.com/windows-limit-cpu-usage-program/