WRT1900AC (v1) awful wireless performance on 1 Gigabit ISP

Hi team,

I'm using Webpass 1 Gigabit internet connection, but the wireless performance on my Linksys WRT1900AC (v1) is only reporting 15 Mbps since I installed LEDE. It used to report around 200-300 Mbps on DD-WRT.

Been trying to find best practices to improve this, but found so many options that I don't know what would be the best route to take. All I did so far was to enable auto-reboot (cronjob) on a daily basis.

Any suggestions would be really appreciated.

Thanks a lot!