Can you provide the link in Google play for the specific app you're referring to?
Apparently, Iím the only person in the entire world that can copy and paste stuff like Fast Reboot
Simulates a reboot by closing/restarting all core and user processes and thus frees up memory. Your phone should be much snappier after using Fast Reboot.
Iíve used that app for years. I have no idea if it does anything worthwhile but it does seem to keep the tigers away; havenít seen one since.