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Plus, as in Egan's Diaspora, virtual entities can hibernate, or live at far lower clock frequency.

I've not read Diaspora (yet!), but this sounds more like Permutation City

I haven't read Permutation City yet, but virtualization in Diaspora is far more advanced. The default, as I recall, is ~800 times meatspace. I recommend reading Stephenson's Anathem first, however.

Edit: The Planck Dive is a follow-on.[0]

[0] http://gregegan.customer.netspace.net.au/PLANCK/Complete/Pla...

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