Rock Pi X WiFi data rates limits

Hello,
I have the Rock Pi X drivers loaded from the Downloads page and the 802.11ac WiFi is working.

I tested the data rate with a few methods with the 2.4GHz and 5GHz WiFi and even though my other computer with 802.11ac gets about 42Mbps with 2.4GHz and 101Mbps with 5GHz with the network, the date rates are about 10-15Mbps with the Rock Pi X with similar WiFi signal strengths.

Any ideas of what the slowdown might be?

are you using the default antenna?

I have the Rock Pi X case with the supplied external WiFi antenna connected.

The WiFi system is getting 84% signal strength via that antenna on either band.

@jack,
Yes, it is the WiFi default antenna.