its entirely relative to the amount of data being transferred, If the File was 4GB and the bird that would relate to a about 1MB/s upload rate, but if you cut the data in half, it still takes the bird the same amount of time to get there, then you are looking at 512KB/s or so. If you keep halving the amount of data the bird travelling gets less and less efficient compared to the internet. Try sending the bird with the printout of a page of a word document, and try e-mailing it as an attachment at the same time. The bird stands no chance in that instance. Its basically the same thing as Chevrolet claiming a certain 230 miles to the gallon on the chevy volt, but only if you drive a certain distance, and on a full charge.