Deco M9 Plus slow LAN speed - help me please

Deco M9 Plus slow LAN speed - help me please
Deco M9 Plus slow LAN speed - help me please
2019-10-17 10:58:22 - last edited 2019-10-17 16:50:35
Model: Deco M9 Plus
Hardware Version: V1
Firmware Version: 1.2.8 Build 20190403

Hi

I’m having some serious speed issues with my Deco M9 plus.

Until recently I had a 100/100mbit internet line, and all was fine. The Deco app speed check confirmed speeds of 90/90 to 100/100mbit, and I was measuring this speed also on my desktop PC over LAN and on several wireless devices (iPhone 8, iPad, labtop PC).

Now my internet was upgraded to 500/500mbit (this is at least what am now paying for). Running test on the Deco app I consistently get over 600/600mbit test results. BUT… everywhere else I test, I remain at approx. 90/90mbit, and this applies for both LAN and WiFi!!

When I plug in my desktop PC directly to the modem, I get approx. 600/600 over LAN (using a 15m Cat6e cable). When I add the Deco over LAN, and no other devices, no switch or anything else, the LAN speed is reduced to approx. 90/90 (adding a 1m Cat7 cable). This is using the same test engine running on the desktop PC.   What is going on here??

I tried taking one of my other Deco’s, resetting it, re-adding to the Deco network and setting this as main Deco. But all with the same poor result.

I’ve not bothered trying to troubleshoot the wireless connection yet, as resolving my LAN speeds has prio.

Help!

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#1
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3 Replies
Re:Deco M9 Plus slow LAN speed - help me please
2019-10-18 01:54:13

@DK-Chris 

 

Thanks for your requesting. From your description, it seems that the negotiation speed between the devices is 100Mbps only, not 1000Mbps, that is why you get 90/90Mbps from the Deco. 

 

First, try to change another ethernet cable ( cat5e or above), and change another ethernet port on both modem and the Deco M9 plus.

 

After that, with ISP router-- main Deco M9 plus-PC only, please run a speed test on your PC and show us the test results; furthermore, please click here to verify the wired negotiation speed on your PC. 

Note: The steps are the same, while you need right click on local area connection or ethernet connection. 

 

Besides, try to set QoS-application priority as standard and clear all the high priority rules. 

 

Please disable anti-virus feature as well.

 

May it help and have a nice day. 

 

 

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Re:Deco M9 Plus slow LAN speed - help me please
Thursday

Any updates on this? I've been having the same problem for months now. I have 2 devices wired to different Deco's in the same room maybe 6m apart. Both devices say there connected with 1.0 Gbps but the data-speed when copying a file is around 100Mbit/s.

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Re:Deco M9 Plus slow LAN speed - help me please
Friday

@johsam 

 

What is the current network diagram? How do you connect these devices together? 

 

How do you connect your devices to the Deco M9 plus? By wired cable or wireless? 

 

How do you transfer the file? Please show us a screenshot which contains the transferring speed. 

 

Thanks in advance. 

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#4
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