It would be useful to know whether it's the physical interface, the MAC (Media Access Control) layer, or the IP throughput that's limiting things here.  Could you run the windows command

wmic NIC where NetEnabled=true get Name, Speed

and post the results back?  The name tell us what model of network adaptor you have and we should be able to see if it can do gigabit speeds, and the speed will tell us what speed it has negotiated with the deco.

Hi all, thanks for the replies:

ajharvey:
C:\Users\Administrator>wmic NIC where NetEnabled=true get Name, Speed
Name                              Speed
Intel(R) Wireless-AC 9560 160MHz  585000000

Kevin:

With your computer connected to the front-end device/modem directly, what is the speed you can get?
I'm not super experienced with networking but as far as I know i have to go thru the router (Deco M9) in order to be connected to the internet... Because my ISP is using PPPoE which isn't plug & play. when i connect direct to modem i get "unidentified network"

And may I know who is your internet service provider?
My ISP is TM Unifi in Malaysia

With your computer connected to the Deco by wired cable, please test the wired speed  you can get and the wired link speed. 

Note: How to check wired link speed: https://www.tp-link.com/support/faq/2265/
Strange, now I get 312mbps which is in line with what I was paying for. Have yet to go thru my whole network switch system to test again but a few hours ago i did already do this test and got 90mbps. Interesting.

Could you please show us a screenshot of the speed test on the Deco App to do a comparison analysis?

 

Besides, please tell me the current hardware, firmware version of the Deco M9 Plus.

1.2.8 Build 20190403 Rel. 4315

Sorry, I forgot to upload the other screenshots


This is WI-FI


This is what Harvery requested



This is wired link speed

this is wired direct to deco m9