low network speed using 5G Wifi

I'm trying to use Wi-Fi to ROS communication between multiple laptops and one desktop. (OS : Ubuntu 18.04 | ROS : Melodic)

The goal is to designate the desktop as a ROS Master and put GPS on the rest of the laptops to display sensor information on the master pc.

Because I used the ASUS ROG Rapture GT-AX11000, I expected high speed.

When I checked a ping between each laptop and master pc indoors, it was 5ms.

But if I go outside and do the same thing, the ping speed is 1000ms, and the performance is not good.

One strange thing is that if I check the ping without ROS communication, high speed is confirmed.

But the speed is very slow as soon as I start the ROS communication.

And when several laptops are connected, some laptops are disconnected. ( I set the IP of each computer differently! )

I would like to ask for advice regarding the website or wifi setting that I can refer to.

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