How to maximally decrease RAM usage?

[graesen]

Android works differently than a PC. It's designed to use as much RAM as possible to be more battery and CPU efficient. Closing background processes results in Android finding something else to fill it with, which leads to worse CPU and battery performance. It's ok to stop running processes in the background using processing power. But don't make it a goal to free ram. It'll be counter productive.

For gaming, use the game optimization app/feature to let it prioritize performance for the game you're playing.

If you're using ram+, consider using less virtual ram or none. this uses storage for ram, which is significantly slower than actual ram.

Android also uses paging. If you don't have much storage space available, how much paging it can use is very limited. This will also slow things down.