@TP-Link Hi, and thanks for your reply.

UPNP is turned off in Deco app.

The speed I get from the Main Deco is constant, - Approx. 250Mbps both up and down as the screen below shows.
I have tried with other computer as well, but the same result. If I connect directly to the Main Deco, the speed seems to be capped.

I live in a house with thick walls and ceiling, so I have set up 6 M4 in the network.
4 in the first floor. Modem and Main Deco on first floor.
2 in the second floor.

My modem is a Genexis Platinum-7840

Speed test result directly from Modem:

Speed test result from Main Deco:

Network Adapter settings for computer used for testing while connected directly to Deco:

Microsoft Windows [Version 10.0.18363.1379]

(c) 2019 Microsoft Corporation. All rights reserved.

C:\Windows\System32>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : LAPTOP-5BGTUR6L

   Primary Dns Suffix  . . . . . . . :

   Node Type . . . . . . . . . . . . : Hybrid

   IP Routing Enabled. . . . . . . . : No

   WINS Proxy Enabled. . . . . . . . : No

   DNS Suffix Search List. . . . . . : corp.xxxxx.com (name of place i work ..)

Ethernet adapter Lokal tilkobling* 3:

   Media State . . . . . . . . . . . : Media disconnected

   Connection-specific DNS Suffix  . :

   Description . . . . . . . . . . . : Check Point Virtual Network Adapter For SSL Network Extender

   Physical Address. . . . . . . . . : 54-EE-A4-25-70-01

   DHCP Enabled. . . . . . . . . . . : Yes

   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . :

   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller

   Physical Address. . . . . . . . . : C8-5B-76-BB-01-CA

   DHCP Enabled. . . . . . . . . . . : Yes

   Autoconfiguration Enabled . . . . : Yes

   Link-local IPv6 Address . . . . . : fe80::a1ae:d74b:1a9:693a%14(Preferred)

   IPv4 Address. . . . . . . . . . . : 192.168.68.119(Preferred)

   Subnet Mask . . . . . . . . . . . : 255.255.255.0

   Lease Obtained. . . . . . . . . . : Friday, February 26, 2021 8:27:06 AM

   Lease Expires . . . . . . . . . . : Friday, February 26, 2021 10:27:06 AM

   Default Gateway . . . . . . . . . : fe80::76da:88ff:fee8:13a0%14

                                       192.168.68.1

   DHCP Server . . . . . . . . . . . : 192.168.68.1

   DHCPv6 IAID . . . . . . . . . . . : 214457206

   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1F-EF-3A-E7-C8-5B-76-BB-01-CA

   DNS Servers . . . . . . . . . . . : 192.168.1.254

                                       192.168.68.1

   NetBIOS over Tcpip. . . . . . . . : Enabled

Wireless LAN adapter Wi-Fi:

   Media State . . . . . . . . . . . : Media disconnected

   Connection-specific DNS Suffix  . :

   Description . . . . . . . . . . . : Realtek 8821AE Wireless LAN 802.11ac PCI-E NIC

   Physical Address. . . . . . . . . : C8-3D-D4-77-1A-DF

   DHCP Enabled. . . . . . . . . . . : Yes

   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Lokal tilkobling* 2:

   Media State . . . . . . . . . . . : Media disconnected

   Connection-specific DNS Suffix  . :

   Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter

   Physical Address. . . . . . . . . : C8-3D-D4-77-1A-DF

   DHCP Enabled. . . . . . . . . . . : Yes

   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Lokal tilkobling* 4:

   Media State . . . . . . . . . . . : Media disconnected

   Connection-specific DNS Suffix  . :

   Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #2

   Physical Address. . . . . . . . . : CA-3D-D4-77-1A-DF

   DHCP Enabled. . . . . . . . . . . : Yes

   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Bluetooth-nettverkstilkobling:

   Media State . . . . . . . . . . . : Media disconnected

   Connection-specific DNS Suffix  . :

   Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)

   Physical Address. . . . . . . . . : C8-3D-D4-77-1A-E0

   DHCP Enabled. . . . . . . . . . . : Yes

   Autoconfiguration Enabled . . . . : Yes

C:\Windows\System32>

@TP-Link 

Hi again.

I had set up some "High Priority" devices under the QoS settings in the App.

After deleting all of them, I now seem to get more correct speed when connected directly to my main Deco.

The strange thing though, is that none of the devices were using internet at the point of my previous testing.

So it seems the Deco App is allocating/saving bandwidth to the High Priority devices even if they are not using any significant internet resources/bandwidth. 

@SpeedyG 

Hello, l just wanted to point out that I'm having the exact same problem. I have a contracted 1000 Mbps rate with my service provider and I'm getting ~950 Mbps download at the outlet port on their gateway (as measured with a Cat 6 to my laptop).

If I run a Cat 6 cable directly from the gateway to my TP-Link S4R and then another Cat 6 from the other S4R port to my laptop I'm consistently maxing out at 250 Mbps. That Cat 6 leaving the S4R normally goes to a switch and the other 2 S4Rs in my network so it then limits the wired/wireless download speeds to 250 Mbps for ALL connected devices. I tried to clear all the QoS options in the Deco app, but it didn't change anything. The gateway is a Pace 5268AC and I have the first S4R set up in DMZ (passthrough) mode. I manually set the exit port from the gateway to 1000 Mbps full duplex and then back to Auto with no change. Appreciate any support.

I just upgraded to the 1000 Mbps plan this week from 300 Mbps and I just now realized that I NEVER had S4R speeds above 250 Mbps with the 300 Mbps plan either.

SOLVED (well, for my setup): Okay, I figured out the problem in my system. I went into the Deco app -> More -> Advanced and changed the Operating Mode from Router (the default) to Access Point.

My wiring was set up as recommended for the Router mode: 

- Internet Provider Gateway -> Deco 1 -> Gigabit Switch -> Deco 2 & 3 and other devices

- Deco 1 was set up in DMZ/Pinhole mode in the Gateway, which is as close as I could get to a Passthrough

- I measured the speed at the 2nd Ethernet port leaving Deco 1 and it was never more than 250 Mbps

When I changed the Operating Mode to Access Point, I also removed the DMZ setting in the Gateway, but I didn't change any wiring. The speed on the 2nd Ethernet port leaving Deco 1 increased to ~800 Mbps (1000 Mbps service) and now I'm getting close to 500 Mbps over Wifi from Deco 2. Of course I can't use the QoS or other advanced features anymore in Access Point mode.

Just to confirm, I temporarily switched the Operating Mode back to Router as a test (did not add DMZ setting in Gateway), and my WiFi speed dropped back to ~242 Mbps, where it was before when the wired speed was limited to 250 Mbps. I don't understand why Router mode causes this cap, but I have verified it is the problem. Maybe a future firmware update will fix this?

I plan to add a 2nd switch to better separate the Gateway and Deco networks and will test again. I'll post again if anything changes 

@SpeedyG 

i still with this problem, but i can't change mode to access point, because deco is my router and I need use PPoE to connect with the internet by my internet provider. How can I fix it? With cat6 from deco justo provide 250mps

Hello,

I have exactly the same problem, I tried to remove the list of device in the QoS settings but I have an error "Try late...", someone got the same problem ?

Julien

  @Vol28 same issue here. Really awful to limit the speed like this. Hope they fix it ..

  @Vol28 thank you this solved my problem, I was capping at 250 Mbps even though my plan was 600 mbps