However, there the computer has huge GPU and CPU, then the feature is unlikely to make a difference. The difference in gaming performance is only noticeable when no other programs are running.
However, the question whether it boosts game performance actually depends on the computer hardware, other apps running in the background, and the game itself. Since the Windows 10 Game Mode is on by default, the feature kicks in once the user launched a game and gives the game priority on your PC. Windows 10 Game Mode On by Default: How to Disable It