Reasons of why S5 mini launcher is better for us?
-It designed for 720p screen. So, it uses less RAM than S5 launcher.
I switched to S5 mini weather widget from S5 weather widget, my RAM usage is better now.
-Latest Samsung launcher for 720p screen.
S5 mini weather widget is different from the S5 one. You can check it. S5 mini widget has min. max. temperature of day, S5 hasn't.