I think we watched the same video 
.
Lately the advice is to turn off “game mode” because it’s outdated. The same goes for “Hardware acceleration”. Maybe older GPU’s can still benefit from these settings.
I turned them both off and experienced a smoother performance. There was no FPS increase but for me 30+ is sufficient.
I’d recommend you just try these different settings. (Remember to reboot your Pc in between).
I hope you’ll see some positive results,
Happy landings