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I can't find the link, but I heard that from a friend and also there a prove, if you take a look at the old videos on dtube, they don't work that fast, but the new ones are all working just fine. Even when I uploaded now in ipfs a little video ''30 mb'' it was uploading so slow. I think they need to improve more this ipfs, something is wrong with it.

It may be a propagation issue. If there is only one node with the data than it will take a long time.