The space organization's shadow network can transfer 91 gigabits per second. For comparison, the average broadband connection speed in the U.S. is 6.6 megabits per second, or more than 13,000 times slower.
NASA does not use simple internet like us as they are doing research they have to transfer files from one server to another or files or pictures from space which are of huge sizes, so they use their server to transfer the files not this our usual internet.
Scientists in the U.K. have created the fastest ever real-world internet connection, using commercial-grade fiber-optic lines to clock up speeds of 1.4 terabits per second. It's believed to be the fastest speed test of its kind and would allow users to download 44 high-definition films in a single second hypothetically.