Interesting and baffling. Feel like posting the code here or at the WC message board?

>>Several things can affect image display speed (forgive me if you've already checked these). First, you can make sure you preload the images so that the mouseover images are loaded when the page is loaded - so they're cached. Second, make sure you have the width and height defined for all images even if they're shown full size. If you have a sample posted, some of us can check it out.
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>As I said, it's the same code. If I save as that code to a file, put that file on the server, pull that file, the result will be in a flash. If I run this code from a WWC transaction, under wc.dll?, the image rollover is slow.
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>And, yes, those rollovers images, as you expected, are loaded in memory at startup of the page and width and height properly defined. The main thing is that wc.dll? has something that the cache can't be run against. I just don't know what it is.