Game Optimizing Service App. Please use the setting of the operating environment for each game with game launcher. It is also referred as bloatware.
Samsung game optimizing service adalah aplikasi untuk perangkat samsung yang tujuannya adalah untuk memaksimalkan performa perangkat anda saat sedang memainkan gim. Game service helps you build basic game functions such as achievements, leaderboards, and saved games at low costs. It is also referred as bloatware.
You'll find it under settings > notifications > advanced if you tap the more icon (three dots in upper right corner) and tap show system apps.
This application is one of the popular app of tools category. I can't see any clear way to disable these type of notifications or notifications for game optimizing service. Game tuner is advanced setting. Samsung game optimizing service is an app for samsung devices that aims to help you take full advantage of your device's performance when it comes to playing games.