If you set your background image to 'tiled' (as you have) and set the scrolling value to 'scrolling' NOT 'fixed' you can do away with all those png's and export as jpg as they take on the background image as well. This doesn't matter with a scrolling background as all images scroll together, it only becomes obvious if you have the background image 'fixed'.I'm still wondering what I could do regarding the large images also. Even creating bitmap copy, and optimizing image doesn't change this size. Xara insists on making png's of everything, and I do know that my incessant and maniacal use of drop shadows contributes.
I created a mock-up of your page and got the images count down to 642Kbs. (If I grouped the whole lot I could further reduce it to 433Kbs in total)
See attached xar
And you can determine whether it exports as a png or jpg by selecting the image (or Group) and going Web Properties / Image (at least in XDProX10)
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