Entanglement speeds up evolution of a pure bipartite spin state, in line with the time energy uncertainty. However if the state is mixed this is not necessarily the case. We provide a counter example and point to other factors affecting evolution in mixed states, including classical correlations and entropy.
@article{arxiv.0806.2456,
title = {Entanglement and the Speed of Evolution in Mixed States},
author = {Judy Kupferman and Benni Reznik},
journal= {arXiv preprint arXiv:0806.2456},
year = {2009}
}