I'm experiencing terrible WiFI performance on my Newifi D2 running on open-wrt 19.07.3. The WiFi speed is performing well. It's just the WiFi signal strength is very weak. This applies to both 2.4ghz and 5ghz. I also tried using version 18.06.8. I'm also getting terrible WiFi performance. I've switched to padavan for now. The WiFi works perfectly on it but I would still like to use OpenWrt.
I also read this topic and saw there's no solution yet.