SDCH looks to be going after a similar problem, but it would cache the templates between browsing sessions rather than just among consecutive pageviews. I'm not sure how well it would work for AJAX-y sites which rely on maintaining Javascript state, though, but potentially you could still use, e.g., localStorage for that purpose.
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SDCH can save bandwidth, but I think the hashbangs are trying to avoid any page load at all. http://en.wikipedia.org/wiki/Shared_Dictionary_Compression_O...
SDCH looks to be going after a similar problem, but it would cache the templates between browsing sessions rather than just among consecutive pageviews. I'm not sure how well it would work for AJAX-y sites which rely on maintaining Javascript state, though, but potentially you could still use, e.g., localStorage for that purpose.