I seriously doubt you're getting 75 MEGABYTES down over Wifi. Did you mean 75 Megabits (Mb)? There is a major difference between Mb and MB. 75 MB would be equal to 600 Mb per second.
Why not? 5 Ghz connections are capable of delivering > 1 Gbit over the... air.
:eyeroll: Sure, and MIT managed to transmit data wirelessly at 1 Tb/s one time. But we're talking about the real world and regular consumer hardware here.
TP-Link Archer C7 can do up to 1300 Mbps over 802.11ac, and costs about $85.