In IE9, when changing pages with the same background image, it is 'flashing'. In Firefox changing pages remain smooth, no refreshing or blinking of the background images.
When looking at the http traffic, the header for the images is 304 - so they shouldn't be refreshed. Can I do something about this?
When you click this link with IE9 you can see the testpage
This is the profile IE Developer F12 makes:
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