New
#11
Buz; my own very limited testing of game mode tells me it's not affecting performance much one way or the other. That might be because I too have decent hardware, and run at only 1080P, so perhaps my system and configuration doesn't need the help.
You are not recording by default unless you enable background recording which also is off by default:
Win+Alt+R starts and stops recording.
My personal view is Game Mode's recording, screenshot capabilities give you another option to similar services like Nvidia's Geforce Experience and its shadow play/share options. Up to you to play around and decide. More options/competition are always a good thing.