TP-Link Deco M9 Plus Review: Tri-Band Mesh Wifi System

TP-Link Deco series of mesh WiFi system have been really great lately. They are easy to setup and performed really well. TP-Link Deco M9 Plus is the upgraded version of the Deco M5 with a Tri-Band design and beefed up specs for better speed.

What is Mesh WiFi?

Well, mesh WiFi isn’t that complicated to begin with. Like all WiFi router, the main unit of a mesh WiFi system will function as a router and it will be connected to the ISP modem directly. Next, it comes with multiple satellite units or mesh nodes where they are all linked together to form a bigger WiFi network.

Image from TP-Link

The WiFi connection will be much faster with bigger coverage as multiple mesh nodes are broadcasting the WiFi network. Besides, as they are all meshed, they all have the same WiFi name and password. You do not need to manually change WiFi as you walk along your home, the Deco M9 Plus will automatically manage it for you. 

TP-Link Deco M9 Plus features band steering and AP steering, it will automatically steer your device to the fastest WiFi network. Besides, with fast roaming enabled, the downtime when switching between mesh node is almost not noticeable.

Hardware and Specs

  • Wireless AC2200 Tri-Band
    • 2.4Ghz Wireless N 2×2 up to 300Mbps
    • 5Ghz – 1 Wireless AC 2×2 up to 867Mbps
    • 5Ghz – 2 Wireless AC 2×2 up to 867Mbps
    • Fast roaming, band steering, AP steering, MU-MIMO, beamforming
  • 512MB RAM Qualcomm IPQ4019 
  • 2x Ethernet LAN/WAN port

As for expansion, it is still rather minimal with just 2 Gigabit Ethernet LAN ports. The Deco M9 Plus also features a single USB port but it only function as a USB port to charge your device for now. It can be handy to plug in an IoT device or just power another device such as a Chromecast dongle.

Hardware and Design

The Deco M9 Plus comes in the twin pack and the 3 pack version. The 2 pack model should be enough for most users but the 3 pack version can be considered for bigger house especially those with 3 floors.

The Deco M9 Plus is basically a bigger Deco M5 since the design is largely the same. There is a single multicolor LED indicator to show the status. The size is still really small and the clean design means you can put it everywhere and it will blend in nicely to your home interior design. There’s still no option for wall mount. 

TP-Link Deco M9 Plus Setup

The setup process is very quick and simple with the TP-Link Deco app. It took us just 10 minutes to get the entire system configured with everything working properly. The app also included helpful tips on where to place your mesh nodes. The setup process is actually very similar to Google WiFi. 

The system is linked to a TP-Link ID so you can manage it no matter where you are as long as you are connected to the Internet. The system can also update itself automatically from the Deco app.

TP-Link Deco M9 Plus Unifi Setup

TP-Link Deco M9 Plus is compatible with Unifi and it is selectable in the app. The configuration is very simple, you just connect the Unifi modem to any port on your Deco and follow the setup guide on the app. The app will prompt you to insert your Unifi PPPOE username and password. Make sure you tick VLAN and select the Unifi profile in the app. 

However, as the Deco M9 Plus only comes with 2 ports. Using the Unifi mode will reserve the first LAN port on the main unit for HyppTV. You cannot use it for other devices even if you do not watch HyppTV.

Deco App and Features

The Deco app also included plenty of features. We really liked the built in speed test tool to test the Internet connection directly from the mesh system. You can also see the realtime usage of each device on the network in realtime.

TP-Link Homecare features

  • Antivirus
  • QoS
  • Parental Control

TP-Link Deco M9 Plus also features TP-Link Homecare suit which include advanced parental control, Antivirus and QoS. The Antivirus is actually powered by TrendMicro. It will prevent your devices from accessing a website and protect it from attacks from the Internet. TP-Link included 3 years of free updates on the Antivirus feature.

Warning shown to devices

The Homecare QoS engine is basically an application priority selector. It lets you to select which application to have higher priority. This is only useful on slower connections. TP-Link also lets you to select which device to have high priority. This will be useful for devices sensitive to latency such as VOIP phones or gaming devices.

TP-Link Homecare parental control is also really powerful. It is able to restrict content to selected devices based on the category. The database TP-Link has built is rather accurate in our test. Besides, there is also an option for usage time limit and usage time scheduling. 

Smart Home IoT Hub

TP-Link Deco M9 Plus is also a smart home IoT hub and features support Amazon Alexa and IFTTT. It supports Zigbee and Bluetooth powered IoT devices. Most devices supported currently are from the TP-Link ecosystem and it depends whether third party manufacturers for this feature.

The full list of supported devices is available on TP-Link website here.

WiFi Performance Testing

Mesh WiFi Backhaul

The mesh backhaul test is designed to see what is the maximum speed that can be obtained on the mesh node on a good signal condition. This test will determine the backhaul capacity of the mesh network.

We manage to obtain a speed of up to a solid 600Mbps in our test with an 1Gbps Internet connection. 

Mesh WiFi Performance

The performance of TP-Link Deco M9 Plus is really impressive in our test. 

The performance of both Deco M5 and Deco M9 Plus is quite similar on single device mode.  On our test setup with the main Deco at short distance, we have no problem averaging at 518Mbps over wireless with my AC1200 laptop. After a distance of over 7 meters and 1 concrete wall, the speed is left around 114Mbps. The Deco M9 Plus is slightly faster than the M5.

On to the mesh performance after the secondary mesh Deco is introduced to the network, we see an improvement of wifi performance up to 200% on the Deco M9 Plus. We can see that a mesh wireless system can not only improve the wireless coverage, it can effectively increase the speed of your wifi network throughout your property. The Deco M5 with a dual-band wireless is also impressive but at a more modest 130% improvement. 

Fast roaming support

Like your mobile phone, roaming happen when you walk from the coverage area of a Deco to another Deco. Roaming is really important as you want your device to be connected to the fastest Deco at all times. You also do not want any downtime when your phone is switching over to the coverage area of another Deco as you walk around your house.

This is where the Deco M9 Plus shines as it supports the 802.11r, k and v fast roaming standards. It lets you to walk from the coverage of one Deco to another with minimal disconnection. Besides, the 802.11r also ensure that your phone is always connected to the best access point so you do not need to figure that out and keep turning your wireless on and off. Currently, most other mesh solutions in the market which rely on their own roaming system as 802.11r is typically only being used on Enterprise wifi gear. 

The Verdict

I think the TP-Link Deco M9 Plus is easily the best mesh wireless system that I have tried so far. The technology is mature enough and properly implemented. I also love the nicely designed, modern hardware as it looks clean in a modern household. The performance is equally as impressive as well. I am satisfied by the performance and I can say that it is compatible with Internet plan up to 500Mbps.

Besides, the software running the Deco M9 Plus is also really important. TP-Link simplified the setup process and make the complex technology almost invisible to the users. TP-Link Deco actually work really well and feel really polished unlike mesh systems from other brand which may be buggy. It also comes with the Homecare suite of features which is handy. TP-Link expertise in Enterprise networking can also be seen here with the 802.11r fast roaming support.

TP-Link Deco M9 Plus

Best mesh wireless system you can buy in Malaysia now. The performance and stability of the mesh network is unbeatable.


Tubi Score

Good Stuff

  • Amazing performance performance
  • 802.11k/v/r fast roaming support
  • Unifi and HyppTV compatible
  • Easy setup and configuration

Bad Stuff

  • Only 2 ports
  • No wall mount
Review Date
Reviewed Item
TP-Link Deco M9 Plus
Author Rating

53 thoughts on “TP-Link Deco M9 Plus Review: Tri-Band Mesh Wifi System”

  1. Solahuddin Ahmadon

    1) does this reduce lag latency in online gaming (planing on double story without using lan)
    2) if i have 500mbps, how much speed will i expect on the second floor?
    3) where can i refer to check it is hypptv capable in tplink website?

  2. Hey I was planning to buy either the Deco M9 or the Tp link AC 3150. Which do you think would be better if my room was about 50-60 feet away from the router. I was thinking of puting the secondary unit in my room.I am looking for speeds of 200mbps and above. I have a 800mbps plan. Thanks

    1. Deco M9 will be better. Don’t put the second unit in your room, put it in the middle between your room to the main unit.

  3. Hi,

    I am currently using Tplink AC3150 router and I have tried using Wifi extender but the Wifi coverage using extender was not as good as expected. Will this Tplink Deco M9 a better option to replace both the router and extender?


    1. Definitely like I always mention, a mesh WiFi system comes with many features to optimize the connection.

  4. Hello,

    I recently purchased the M9 with your review being a big part of my decision making. A very big thank you for that.
    I am however, interested in purchasing a smart lock. Wither the August Pro or the Kwikset Kevo with both devices having bluetooth connectivity. I posted questions to TP-Link, August and Kwikset but they cannot confirm whether the smart locks can connect directly to the router via bluetooth and hope you can advise me.
    Both of the smartlocks have Wifi Bridges sold separately to connect to the internet but i was thinking to cut out the middleman and connect direct.

    Looking forward to your response and keep up the good work!

    Thank you

  5. Hi. I’m planning to change my original router from TM (Acher AC1200) to a better one.
    Currently upstairs was old modem from previous streamyx repeater.
    Thinking of 3 system
    1. ASUS RT-AC88U
    2. ASUS RT-AC5300
    3. DECO M9 Plus

    FYI my UNIFI PLAN was 500 Mbps.
    Any recommendation? Living on 2 storey.

  6. Hi Alvyn, it’s a great review that really sparked interest for me to get this. Though I’m wondering on a few things:
    1. Mesh wifi improving speeds, but does it affect latency?
    2. How best to connect between the nodes? Wirelessly or through lan cable? (and if so, are speeds affected?)
    3. Just wanted to confirm compatibility with Maxis?
    (I only know the basic stuff and isn’t an expert with all the other stuff)

    1. 1. Wireless will definitely affect latency but it depends on signal and interference. For my case it fluctuates between 2-5ms more than wired LAN.
      2. LAN will be the best but wireless is decent as well.
      3. Compatible with Maxis but existing router is required. The Deco series do not have VLAN tagging ability yet.

  7. hi ,
    im planning to switch to new router and this was a good review ,but i need to know is it HyypTv will be definitely made available on this device.

  8. Hi Alvyn,
    I just got a deco m9 but having issue during setup.
    1. I removed Dir850L and swapped with one deco.
    2. Followed the app step. Set up the pppoe unifi id and password (new password from tm).
    3. Set up WiFi which connected.
    4. It keeps saying can’t connect to Internet despite multiple reset .
    5. I replaced the deco with Dir 850 back and used the new password and no issue . Connection back normal

    This is my issue. Not sure what I could do because it seems the issue is from the router not connecting.
    Please advise . Thanks

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