Thanks for bringing this up! Just wanted to let you know that we removed the Memory Booster feature starting from version 16.0. It is replaced by App Freeze, which helps extend your battery life, reduce app notifications, and optimize your device's performance.
What is App Freeze in Trend Micro for Android? | Trend Micro Help Center
As for the Mobile Security app always running in the background, that's actually for the Web Guard feature, not for system optimization.
It's there to keep your browsing safe.
If you have any other questions or need more info, feel free to ask!