@pavel_105 

Hey

I have to be honest and say I think you are looking for a problem here that doesn't exist. 

If you are getting pings in the average of single digits, that is a superb result over WiFi and well within what would be expected.  It would be virtually impossible to get a 1ms ping over WiFi on any device, sadly if you say you have experienced this before over WiFi it's likely an error or false positive, I will try to explain.

WiFi is a shared medium, by that it is meant that only 1 device can connect / talk to the AP at any time.  Therefore when you send a PING over WiFi, the device has to negotiate with the AP to allocate it a time slot to send that data (the ping itself).   Should another device be using the airspace at that time, your ping will be delayed for a period of time (called a guard interval) to avoid a collision.   Should it have a collision (two devices sending at same time) its further delayed as this is retried and a guard is applied.    All this "negotiation" with the AP delays the actual ping being sent, usually by 2-8ms per ping, this will also be the same on the return.

Even in the vvv best of WiFi networks, 3-8ms for WiFi ping is an awesome result, and yes this will jump to 50, even 100 if there is others sending / collisions / retries etc happen. 

I have installed hundreds of WiFi networks and what you show as a ping result is perfect, even the vendor HP say anything under 20ms local for WiFi is great.

Honestly, dont think you have an issue here and its working as expected.