LTE base HAT connected to PC

Dear Forum
We connected the HAT with EC25 to a window PC, via USB, after download the driver.
After this,appear in the device manager, 3 new COM:
COM AT
COM DM
COM NMEA

We give simple command, and seems the module reply OK…

Question is: The COMx normally are speed limitated around
115.000 bps or max the double…but not around 50Mbps or similar.
So, How can I transfer data fast, if limit is the COM ?

Thanks for your time
Roberto