@TP-Link 

Hi there. Hope ur safe and sound.Thx for ur reply.

After refreshing web ui cpu load comes to 0% but in a sec it again goes to 100% ! but again in later sec it goes to 30% or 70%. But my network structure is like- iSP>Deco m4(1st unit)>My PC(Ethernet)>Deco m4(2nd unit via mesh network from 1st unit no ethernet connection). Wifi connected device-5 mobile>Tv that's it. 

Do you need any info plz knock me..

@Choklate 
I am having the same issue. 
CPU load constantly spikes to 100% and causes constant wifi connectivity issues. 
I would really like a fix for this issue.

I'm here having the same exact issue with my deco M4R's v2 ___ 1.4.3 Build 20200918 Rel. 74289

I set one of them as a router and connected a switch to it to feed my other 4 deco's via ethernet cables and i'm getting 100% CPU use almost all of the time on the main deco (router) and even the other units, I also tried to set them as access point's only with the main router tp link ac1900 v3 but i'm still getting CPU spikes to 100% on all the deco units.

I think this is a hardware limitation because sometimes I can't even open the webUI its not loading or if change something in the settings it tells me that the (operation failed). 

@Choklate where do you get the CPU usage information?

@TP-Link 

Yes, I was hoping it will fix the CPU usage but if its not gonna solve the problem then I don't need it.

Yes, I have 9 deco M4R .. 1 of them is the main router connected via PPPoE, 4 of them are connected via Ethernet, and 4 are connected via WiFi as shown in the picture above.

I have around 33 devices connected to the deco's: (7 laptops, 4 iPads, 2 TV's, 1 PS4, 1 PS3, 1 PC, 16 Mobile phones, 1 Eufy robot vacuum).

For the CPU usage I don't need to refresh the webUI, it happens in real time. I have a video attached down below to show the CPU usage spikes.

The picture above shows the error I get when just trying to open the WebUI.

Aside from this issue sometimes when i'm surfing the web I notice a delay in loading the web pages so I did a ping test on the main router (M4R deco)  and noticed that sometimes the ping spikes to > 100 - 400 ms.

Those are the issues I noticed so far.

I really hope the stability and performance of the M4R deco gets improved because its clear that the units are struggling with the performance.

@TP-Link 

You welcome .. yes please do forward it to them.