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I just verified it again.
The covers downloaded from Amazon (For Kindle eInk) are usually between 200-220 width and 300-330 height grayscale (8bit).
Using the same maths will result in around 500kb ram for one cover displayed. For 500 covers you might end up in using 256mb of ram (in case all covers are loaded once rather than 6 covers on demand per slide).
It might make sense (and I keep a mental note for myself here). To scale all calibre covers to around that size + turning them into 8 bit grayscale. To avoid possible crashes.
Maybe calibre has an option to scale covers before side-loading them to the Kindle ?
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