Found it as well! Thank you. So far I tested it with Speedtest app.
Using wifi at home my normal rate without download booster - 50 - 55 mbps download, 12 mbps upload
Using wifi with download booster on and 2 - 3 bars of 4g LTE (My house doesn't get great speeds under LTE but they are decent) - 69 - 72 Mbps download, 13 mbps upload
Using LTE 4G only - 16 - 18 mbps download, 7 - 8 mbps upload.
Using LTE 4G with download booster no wifi - same as using LTE 4G by itself (Not sure why I tested that but just want consistent numbers)
Found that interesting.