Hi,
I have openede a similar thread earlier but I am still facing with this issue since then. Nothing changed. I am changing my channel, restarting modem and all other stuffs tested but still maximum speed that I am getting is 230-250 Mbps sometimes less as well but not more then 250 in general.
I tested my speed via wired connection as well as 5GHz wi-fi too. But it is the same.
Earlier, last year which was 2021 somewhere, I was getting 600-700 Mbps even it was not 1000 Mbpgs but at least affordable but now it has dropped significantly.
Coould you please help me on this ? As I did all checks from my end, followed all the tips and I know more or less all configurations of modem(s).
I have Zyxel VMG8825-T50 by the way with up-to 1000 Mbps subscription and my house/address is supported with high-speed (1Gbit) infra.
I have also tested mobile device (iOS, android), laptops (Windows OS and MacOS) both wired and via speedtest.net.
Thanks
Hello
Do you only make use of the Zyxel router or do you have another router, switch or extender behind it?
You could try a factory reset of the router by pressing the reset button on the back of the Zyxel for about 10 seconds using a small object to see if it improves anything?
The best way to check your wired speed is connecting a laptop/pc directly to the router, use the ookla speedtest app so not via the website and use a CAT5E cable or higher.
Different testservers, cables and devices can also be tried.
Thanks for your reply. Sorry, I had no time to combe back to you earlier.
I have no other router or wi-fi extender. I am only using Zyxel for tested Wi-Fi and/or wired connection. But I have a device provided by T-Mobile which is a media Converter has 3 & 4 is up and the rest are down. I recognized that it was a recommended config and applied by T-Mobile technician (or KPN requested by T-Mobile).
I did reset 
I tried with a brand-new CAT5E cable which supports 1Gbit.
Unfortunately…
Today, before my post, I tried speedtest again and now it is 280 Mbps and still low but higher than yesterday etc.. Tested under same conditions.
Thanks
Are you performing the wired speedtest on a laptop/pc? Could you also check on another laptop/pc? Running your laptop/pc in safe mode could also by tried so all the things that could reduce the speed will be minimised and then do a speedtest.
I have tested with laptop/pc (Windows OS) both wired and Wi-Fi (5ghz). I don’t have any other laptop/pc sorry. I don’t think so this measurement could be so complicated. I only opened one page of internet browser, chrome, and tested so far. No Download and/or streaming was peformed by laptop during speed test.
Hi
Please do understand that wifi-speeds are never a given and are always dependable on thousands of factors, such as: neighboring networks, the walls inside your home, different devices, old connections, the placing of modem and/or extenders and many, many more.
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