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The San Disk Connect Wireless Flash Drive (just rolls off the tongue doesn’t it) uses 801.11 b/g/n, so if you are using an 801.11n compatible device, there is a theoretical transfer rate of up to 600Mbps, although you will likely see less. It will be much better than a slow internet connection in any case.
Or you can use a RAVPower 5-in-1 Filehub with unlimited storage and fast transfer rate. And you got a 3000mAh battery pack built in which will save life on occasion. I personally have one of this, I have used it to stream 720P movies simultaneously on several devices with my family, there was no problem and it‘s fluent.