Very, very slow usb 3.0 speed

I recently bought a 1tb seagate expansion portable hard drive to use as a backup and when I selected al the info I wanted (several files, 400gb) the transfer began at 50 mb/s but started decreasing constantly and the speed is now 2.69 mb/s.. Why is that?? the origin drive is a standard hdd.
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  1. do you have usb3 ports on your computer? They are blue.
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