I am using this app in my cell phone from since 5 months.Its very good. its removing all the junk files from whatsapp and every junk stuff.It saves your battery and also boosts your phone.It only removes junk files.It never deletes wanted files.it scans for viruses in your phone and removes it efficiently.It also checks temperature of our phone and it cools the device. we are highly satisfied with this app as it cleans any unwanted temporary & Junk files. It will improve your battery life also.We had not faced any hanging issues with this app.I hope you would also like this app.