Step 1. Measure the wifi performance, I got it from 40Mbits/sec to 70Mbits/sec :)

on the router side install and run iperf

sudo opkg install iperf

iperf -s

on the laptop/any wireless distro install iperf and run it

sudo apt install iperf

iperf -c -t60 -i1

after a while you will get the results.

Editing the /etc/config/wireless file, settings should look like this

config wifi-device 'radio0'
    option type 'mac80211'
    option channel '11'
    option hwmode '11g'
    option path 'platform/10180000.wmac'
    option htmode 'HT40'
    option country '00'
    option legacy_rates '1'

The following options will be enabled (all disabled by default):   

bursting: Enables frame bursting    

ff: Enables fast frames    

compression: Enables hardware compression

turbo: Enables turbo mode

First make a copy of the /etc/config/wireless

sudo cp /etc/config/wireless /etc/config/wireless.bak

and open to edit the /etc/config/wireless

add the following lines to the config wifi device 'radioX', can be radio0 or radio1

option bursting 1

option ff 1

option compression 1

option turbo 1

Now a reboot or /etc/init.d/network restart is needed and test again the wifi performance as showed in the first step.