Very large responsive background images

Just a quick question with these - for example the page here:
http://www.destinationsshow.com/
Not so much the CSS, but the knack to get such a large image that isn't too big in terms of file size, but still retains pretty good quality when very large?
Also, I noticed on that example the original image is actually made up of two copies of the image with one mirrored vertically.
You can see what I mean here:
http://www.destinationsshow.com/images/splash_2014_bg.jpg
Is that significant?
Thanks for any pointers.

Your example uses two different background images
The mobile one is 18 KB
420px × 667px.
The desktop one is much bigger, 198 KB
2,000px × 2,666px
In my example below,  140 KB
900px × 675px.
http://alt-web.com/TEST/Resizable-BG.shtml
Nancy O.

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