After various attempts of optimization,
this app was discontinued and maybe renewed in future. Unfortunately my health is really bad lately. I can't update it now.
(Really takes too much time and work to complete it; plus, first releases crashed when start, in many devices and have many bugs)
BUT not everything is lost:
instead to clear the Filza Trash, Keyboard cache and Safari cache, like latest releases.
Useful in few situations, i know, but now that's is.