You should do the Parallax effect for moving the page down and together do the loading on demand, the same loading on demand used in paging. But instead of loading the page you will load the articles, news and etc., to have a quick effect for an internet up to 512kb, (512kb mobile plans in smartphone accessing the site in case you make the site with responsive design).
You need to optimize the content of the page, use as few images as possible (using more CSS3), and when using images, you will have to optimize them to avoid weighing, so you will get a quick effect.
An image optimization tip is to use the function thumbnail to regulate the quality of the images, but there are several other ways to do this. It’s my suggestion, of course it would be a lot of work, but without work you can’t get good results that are worth being appreciated.
There are also plug-ins on the internet that help.
Here’s a tableless tutorial explaining how to make a simple Parallax effect: http://tableless.com.br/parallax-simples-com-jquery-e-css/
– gumaro