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We consider the problem of efficiently migrating desktop virtual machines. The key challenge is to migrate the desktop VM quickly and in a bandwidth-efficient manner. The idea of replaying computation to reconstruct state seems appealing. However, our detailed analysis shows that the match between the source memory and the memory reconstructed via replay at the destination is poor, even at the sub-page level; the ability to reconstruct memory state is stymied because modern OSes use address space layout randomization (ASLR) to improve security, and page prefetching to improve performance.