Why CPU usage is too high when playing games

You should try update the windows or restart the windows to fix the High CPU Usage. Check out this tutorial https://techclicky.com/how-to-fix-high-cpu-usage-problem-on-windows-11/

What Windows build are you using?

What is the cpu usage when not playing games?

I play graphic intensive PC games on two different computer - one has the Ryzen and the another one has Intel. High CPU usage is more prominent on Intel, but I can't say that it is non-existent on the Ryzen one.  

High CPU usage during games isn’t just an Intel thing—Ryzen CPUs can experience it too. It depends more on the game’s optimization, background apps, and GPU bottlenecks. That said, Intel CPUs tend to boost clock speeds aggressively, while Ryzen relies more on core efficiency, so how each handles load may look different, but both can hit high usage if the game is CPU-heavy.