Hadrien,
Your book is slow because the chapters are not splitted into separate flows. While technically it does not violate the spec (and it passes epubcheck), it places very high processing burden on the reading system. It will only be worse on the handhelds, which might not even be able to load the whole book because of the memory/CPU constraints.
This is a common problem and Digital Editions beta detects this. When you see a slowdown, check "Item info" and if you see this message: "Document contains a resource which is too long", there is a good chance that this book won't be fully readable on handhelds.
Peter Sorotokin
Adobe Systems - Digital Publishing
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