This setting may reduce lag on older phones with a smaller RAM size. However, it is a developer option, meaning it can lead to a crash especially when multiple apps are involved, and it can drain battery faster.
Three ways to set Android background process cache limit
1) Settings >> Developer Options >> Applications > Background Process Limit.
To enable Developer Options, use Settings >> About Phone >> find the build number >> tap seven times.
2) Use this command with root access, where x is the number of background processes.
service call activity 51 i32 x
3) Use this app: https://github.com/flode/SetAndroidProcessLimit . An *.apk file is also provided.
Minimum Android version = 4.0
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