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Under Windows 10 the CPU (60-80%) and the GPU (100%) are very high when playing.
This is probably due to the fact that the FPS (frames per second) is quite high and goes above 2000-4000 FPS.

Apparently it's because of the vSync. Please just follow the thread:

• A Mortician's Tale: CPU & GPU high, limit FPS

QualitySettings.vSyncCount = ?;
Application.targetFrameRate = 144; // Maybe not a good idea to limit FPS?!

You may still need this here:

• Unity Docs: Quality
• How to limit FPS
  
• How to limit frame rate in Unity Editor
  
• 4 Quick Ways to See a PC Game’s FPS
  
• Unity Docs: Application.targetFrameRate