D-Link dir 300, problems with wi-fi speed. How to decide?

Question

WiFi

I set up a router, on channel N it gives out a speed of about 40 Mbps, while directly about about 80, tell me what could be the problem. What I have already tried: I changed the TX preamble, the channel width (I tried all the options, now they are short preamble and 40MHz), turned WMM on and off, installed a new firmware. Tested on many devices, the result is similar

Model: www.dlink.ru/ru/products/5/1784_b.html

Answer 1

1. what do you measure
2. who is the client
3. distances and obstacles
4. 802.11n happens in 2GHz and 5GHz - which one do you have? fill in the screenshots of the settings, and even scan the air and show who surrounds you from wifi networks.
5. Personally, I am against soho dlink and would suggest to throw it away/sell it for juice and buy mikrotik rb2011.

Answer 2

You won't like my answer, but your router is low-end budget shit and that's its speed ceiling in ideal conditions, no longer pulling the processor.

Answer 3

Do you encapsulate traffic in some way? pptp/l2tp?

Answer 4

40 is still divine, humble yourself.
But in general - you can increase the speed by turning off encryption / using simple encryption. That's just ... Well, you understood.
You can also turn off QoS and other network wiches - upnp, firewall and other marketing nonsense (this will unload the cpu of the router, it will become faster to encrypt traffic).