we have a GL-AR300M-EXT.
When we power on the router, the Wi-Fi takes more than 1 minute to start. How can we speed up this time?
After start up if it is stable, it should be OK. Now there is not too much to start it faster.
But what you can try is:
Remove unnecessary kernel modules, check /etc/modules-boot.d/ for all modules
Remove unnecessary programs, check /etc/init.d/ for all start programs. Disable one program