Since the last SD release 3.6.3.28529 it has become virtually unusuable on my Samsung Note 4. Even typing the password sees huge delays between typing the letters and them appearing on the screen and screen rebuilds as you zoom in and out are very slow. I have just update the Os to version 6.0.1 but if anything that has made it worse. Can't see any issues on other apps and seems fine on my IOS device. Can I go backwards to the previous version?

John