My Acer Iconia W700 Windows 8 tablet went very slow and buggy after installing Windows 8.1 update.

I have tried making it fast and less buggy by installing care sorfware like Advanced Care 7, Jet Clean but it still very slow and buggy.

Can anyone help me to make my Acer Iconia W700 fast again and not buggy just like before the Windows 8.1 update

Is it possible to go back to Windows 8 from 8.1?