Hello i found out that when i play wow and Alt tab from the game “Dekstop Windows manager” goes to 99% gpu usage and it only happens when i play wow and Alt tab from the game
Perhaps you should report it to the developers as a bug then?
how I can do it?
In EU we report bugs ingame:
Press Esc or click the ? button to open the menu.
Click Support.
Click Submit feedback or bug report.
Enter the details of the bug into the Submit a bug description box, making sure to follow the guidelines outlined on the submission form.
Click Submit.
You won’t get an acknowledgement or reply but it goes straight to the people who can look into it.
It should be noted that the “Desktop Windows Manager” is actually part of Windows, not WoW itself - and the displayed load rate is notoriously inaccurate/misleading under almost any circumstance, as it doesn’t actually show the effective load but rather a projected estimation. 
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