There are many causes for high CPU usage. Here are some possible solutions:
Try Running DISM command to decrease high CPU usage
1. Right-click on Start and select Command Prompt (Admin), sign in with your administrator account.
2. Type: DISM.exe /Online /Cleanup-image /Restorehealth and hit Enter.
3. Type: DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:C:RepairSourceWindows /LimitAccess and hit Enter.
4. Type: sfc /scannow and hit Enter; Restart PC.
Or try (for SSD) Disabling Superfetch and Windows Services to fix Windows high CPU usage. This one is more experimental in that you have to try
1. Press Ctrl + Shift + Esc to open Task Manager.
2. Go to Services tab and click Open services.
3. Navigate and locate Superfetch, right click on it and select Properties.
4. Click Stop to end the Superfetch service and click OK to confirm the change.
5. Press Win + R to open Run dialog > Type: msconfig and click OK.
6. Check Hide all Microsoft services under Services tab > Uncheck all other remaining services > OK to save all changes.
7. Restart Windows 10> Enable any services individually and reboot PC > Repeat the process till Windows 10 the high CPU usage stops.
Let us know how it goes.