The web interface "Experience" tab presents you with these following options:
Check this option to scale the connection image. The maximum size of the connection will be the original desktop size.
Check this option to enable RemoteFX. Read More about Remote FX. This option affects other settings.
Check this option to show the desktop background.
Check this option to show Windows Visual Styles: the appearence of common controls, colors, bordes, and themes.
Menu and Windows Animation
Check this option to show menu and Windows animation when you scroll or expand a drop down menu.
Check this option to allow "Clear Type", a font smoothing option added to Windows Server 2008.
Show Window Content While Dragging
Check this option to show the contents of the window while being dragged. Otherwise a transparent border is dragged.
Check this option to configure the DWM to redirected the desktop drawing to off-screen surfaces in video memory.
Also, the desktop will present many visual effects.
All of these options enhance the look of the remote desktop and use more bandwidth.