@oller I'm having the same issues

Just sent an email to TP Link support, I'll copy paste it here since my experience might be useful to the community

The firmware of my unit is up to date, on version 1.5.1

The ping issue is present also when connecting my laptop via ethernet to the main deco, but it’s not there when connecting my laptop directly to my modem, so the issue is in the Deco.

The issue started from some weeks ago, when i updated the Deco from 1.5.0 to 1.5.1, the issue might be the update, but I’m not certain about it

The network map is in the following image. I can make some clarifications regarding it:

The main deco (called “estensione”) is connected to the “Sala Giochi” one wirelessly, most devices are then connected to the Sala Giochi one either trough Ethernet (there is a switch) or wirelessly.

The “Camera di Ale” is connected via ethernet backhaul to the “Sala giochi”.

The “Serra” is connected wirelessly to the main deco, but the thing that I find really strange (in the past it wasn’t like so) is that the “Study” Deco (that is an M5) is not connected to “Serra” that is the nearest one, but it’s connected to “Estensione”. In the past it wasn’t like this, “study” was connected to “serra”.

Here is also a screenshot of the ping spike test, ping spikes are variable, not Always like this, but still WTF

PLEASE FIX THIS ASAP it’s not acceptable to have such issues

@Alexjj 

Thank you very much for the details.

I would like to forward your case to the senior engineers and please have a check of your email box.

@Takkhor 

Hi, I noticed the PC was connected to the 2.4ghz and could you please turn off the 2.4ghz and check whether 5ghz had the same issue?

--or if the PC supported Ethernet connection, please also check the ping result via Ethernet cable;

By the way, did all the devices have the ping spike issue or just this laptop?

Can I also have a picture of the network map on the web UI in case I might need to forward your case to the senior engineers;

Thank you very much.

I think I found to problem about ping spikes . when I close the (Mesh Technology) the ping spikes problem will be solved . 

@fl00000 @TP-Link can you please transfer my case to the senior engineers? I tried your solution but with it my computer still have some connection/ping issues with the network...   

@Jzlim Hi, how have you gotten on with this issue? I am currently facing the exact same issue with the M4's.

@PJRConnor 

Hi,

Some users replied that turning off the fast roaming/beamforming as well Mesh Technology would help, have you tried that?

If still the same, could you please help me check the following information：

1. Did all your mobile devices have the ping spike or just particular devices?

2. Can I have some pictures of the ping test on the computer?

3. Can I have a picture of your network diagram from the ISP modem to satellite Deco units?

4. Did the ping spike only happen to the wireless connection, Ethernet connection worked fine?

Thank you.

@TP-Link I have bought two Deco M9 Plus units recently. I have seen the same problem while gaming and can confirm that disabling mesh technology, fast roaming and beam forming has helped. Disabling the technology that gives these devices their leverage leaves a bitter aftertaste though.