The girl has textures only on the head. The head is a different part to animated faster because atherwise it will stuck for a wile..show hide the head or the body and animate..If you are animating the face turn of the skin modifire and turn it on agen if you want to render
The animation that you will found was made for a school exercise..It's an actress animation
The body has 17.214 polys and the head:51.564 the hear are also a differend object 400 polys but you can hide ore delet them..
my computer: intel core i7 2,20GHz/nvidia Geforce 576 1.50gb/ RAM 8GB. It runs good..