If the workflow doesn't involve needing immediate access to new and updated data, you could set up some sort of data mirroring so that the data is local to each site. That way, the data is only sent once, rather than every time a user looks at it. You will have periods of disjoint data, though.
I'm going to test this with one of our UK sites first, just so that we have a current offsite backup more than anything else, I guess if we schedule it right we could do the sync to China while they're asleep. This won't be the real fix though as a lot of the image viewing is done through our business management app which relies on indexing images stored in a central location. What if the images were stored offsite in a data centre somewhere?
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