1: Should I use a Dashboard?
Yes you can use dashboard but be care full about images and visualization, the mobile screen is comparatively small as PC/MAC. As We have developed a site where we are using only two graphs which is displayed just after the header(20px height , width 100% each) , we use only 1px red and green repeated images.
2: There is some images associated with the news feed on the home pages of this website?
You can use sprites to minimize number of request to the server; this will boost your performance.
Below the header graphs we are displaying 5 Li (Orders delivered 5/10, Order picked 10/100) etc, these LI(Area) is decorated with corresponding images.
3: There is some images associated with the news feed on the home pages of this website, so it slow down the loading page?
You can view this demo for pre loading images and sprites